compass and chunky png error while compiling sass files to css

chunky_png_error

Interrupt on line 102 of /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/chunky_png-1.2.0/lib/chunky_png/canvas/operations.rb: 
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/chunky_png-1.2.0/lib/chunky_png/canvas/operations.rb:101:in `each'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/chunky_png-1.2.0/lib/chunky_png/canvas/operations.rb:101:in `replace!'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/compass-0.11.5/lib/compass/sass_extensions/sprites/engines/chunky_png_engine.rb:17:in `construct_sprite'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/compass-0.11.5/lib/compass/sass_extensions/sprites/engines/chunky_png_engine.rb:14:in `each'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/compass-0.11.5/lib/compass/sass_extensions/sprites/engines/chunky_png_engine.rb:14:in `construct_sprite'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/compass-0.11.5/lib/compass/sass_extensions/sprites/sprite_methods.rb:68:in `generate'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/compass-0.11.5/lib/compass/sass_extensions/functions/sprites.rb:98:in `sprite_url'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/compass-0.11.5/lib/compass/sass_extensions/sprites/sprite_map.rb:51:in `send'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/compass-0.11.5/lib/compass/sass_extensions/sprites/sprite_map.rb:51:in `method_missing'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/compass-0.11.5/lib/compass/sass_extensions/sprites/sprite_map.rb:42:in `to_s'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.10/lib/sass/../sass/script/list.rb:44:in `to_s'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.10/lib/sass/../sass/script/list.rb:44:in `map'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.10/lib/sass/../sass/script/list.rb:44:in `to_s'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.10/lib/sass/../sass/tree/visitors/perform.rb:215:in `visit_prop'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.10/lib/sass/../sass/tree/visitors/base.rb:37:in `send'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.10/lib/sass/../sass/tree/visitors/base.rb:37:in `visit'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.10/lib/sass/../sass/tree/visitors/perform.rb:18:in `visit'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.10/lib/sass/../sass/tree/visitors/base.rb:53:in `visit_children'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.10/lib/sass/../sass/tree/visitors/base.rb:53:in `map'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.10/lib/sass/../sass/tree/visitors/base.rb:53:in `visit_children'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.10/lib/sass/../sass/tree/visitors/perform.rb:27:in `visit_children'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.10/lib/sass/../sass/tree/visitors/perform.rb:39:in `with_environment'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.10/lib/sass/../sass/tree/visitors/perform.rb:26:in `visit_children'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.10/lib/sass/../sass/tree/visitors/base.rb:37:in `visit'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.10/lib/sass/../sass/tree/visitors/perform.rb:234:in `visit_rule'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.10/lib/sass/../sass/tree/visitors/base.rb:37:in `send'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.10/lib/sass/../sass/tree/visitors/base.rb:37:in `visit'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.10/lib/sass/../sass/tree/visitors/perform.rb:18:in `visit'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.10/lib/sass/../sass/tree/visitors/perform.rb:144:in `visit_import'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.10/lib/sass/../sass/tree/visitors/perform.rb:144:in `map'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.10/lib/sass/../sass/tree/visitors/perform.rb:144:in `visit_import'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.10/lib/sass/../sass/tree/visitors/base.rb:37:in `send'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.10/lib/sass/../sass/tree/visitors/base.rb:37:in `visit'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.10/lib/sass/../sass/tree/visitors/perform.rb:18:in `visit'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.10/lib/sass/../sass/tree/visitors/perform.rb:144:in `visit_import'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.10/lib/sass/../sass/tree/visitors/perform.rb:144:in `map'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.10/lib/sass/../sass/tree/visitors/perform.rb:144:in `visit_import'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.10/lib/sass/../sass/tree/visitors/base.rb:37:in `send'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.10/lib/sass/../sass/tree/visitors/base.rb:37:in `visit'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.10/lib/sass/../sass/tree/visitors/perform.rb:18:in `visit'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.10/lib/sass/../sass/tree/visitors/perform.rb:144:in `visit_import'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.10/lib/sass/../sass/tree/visitors/perform.rb:144:in `map'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.10/lib/sass/../sass/tree/visitors/perform.rb:144:in `visit_import'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.10/lib/sass/../sass/tree/visitors/base.rb:37:in `send'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.10/lib/sass/../sass/tree/visitors/base.rb:37:in `visit'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.10/lib/sass/../sass/tree/visitors/perform.rb:18:in `visit'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.10/lib/sass/../sass/tree/visitors/base.rb:53:in `visit_children'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.10/lib/sass/../sass/tree/visitors/base.rb:53:in `map'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.10/lib/sass/../sass/tree/visitors/base.rb:53:in `visit_children'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.10/lib/sass/../sass/tree/visitors/perform.rb:27:in `visit_children'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.10/lib/sass/../sass/tree/visitors/perform.rb:39:in `with_environment'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.10/lib/sass/../sass/tree/visitors/perform.rb:26:in `visit_children'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.10/lib/sass/../sass/tree/visitors/base.rb:37:in `visit'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.10/lib/sass/../sass/tree/visitors/perform.rb:47:in `visit_root'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.10/lib/sass/../sass/tree/visitors/base.rb:37:in `send'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.10/lib/sass/../sass/tree/visitors/base.rb:37:in `visit'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.10/lib/sass/../sass/tree/visitors/perform.rb:18:in `visit'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.10/lib/sass/../sass/tree/visitors/perform.rb:7:in `send'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.10/lib/sass/../sass/tree/visitors/perform.rb:7:in `visit'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.10/lib/sass/../sass/tree/root_node.rb:20:in `render'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.10/lib/sass/../sass/engine.rb:300:in `_render'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.10/lib/sass/../sass/engine.rb:247:in `render'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/compass-0.11.5/lib/compass/compiler.rb:136:in `compile'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/compass-0.11.5/lib/compass/compiler.rb:122:in `timed'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/compass-0.11.5/lib/compass/compiler.rb:135:in `compile'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/compass-0.11.5/lib/compass/logger.rb:45:in `red'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/compass-0.11.5/lib/compass/compiler.rb:134:in `compile'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/compass-0.11.5/lib/compass/compiler.rb:114:in `compile_if_required'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/compass-0.11.5/lib/compass/compiler.rb:99:in `run'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/compass-0.11.5/lib/compass/compiler.rb:97:in `each'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/compass-0.11.5/lib/compass/compiler.rb:97:in `run'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/compass-0.11.5/lib/compass/compiler.rb:122:in `timed'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/compass-0.11.5/lib/compass/compiler.rb:96:in `run'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/compass-0.11.5/lib/compass/commands/update_project.rb:37:in `perform'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/compass-0.11.5/lib/compass/commands/base.rb:18:in `execute'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/compass-0.11.5/lib/compass/commands/project_base.rb:19:in `execute'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/compass-0.11.5/lib/compass/exec/sub_command_ui.rb:43:in `perform!'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/compass-0.11.5/lib/compass/exec/sub_command_ui.rb:15:in `run!'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/compass-0.11.5/bin/compass:25
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/compass-0.11.5/bin/compass:39:in `call'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/compass-0.11.5/bin/compass:39
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/bin/compass:19:in `load'
  /home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/bin/compass:19

getcwd_error

/*
Errno::ENOENT: No such file or directory - getcwd

Backtrace:
/home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.4/lib/sass/../sass/importers/filesystem.rb:16:in `expand_path'
/home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.4/lib/sass/../sass/importers/filesystem.rb:16:in `initialize'
/home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.4/lib/sass/../sass/engine.rb:151:in `new'
/home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.4/lib/sass/../sass/engine.rb:151:in `normalize_options'
/home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.4/lib/sass/../sass/engine.rb:226:in `initialize'
/home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.4/lib/sass/../sass/engine.rb:199:in `new'
/home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.4/lib/sass/../sass/engine.rb:199:in `for_file'
/home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.4/rails/../lib/sass/plugin/compiler.rb:319:in `update_stylesheet'
/home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.4/rails/../lib/sass/plugin/compiler.rb:181:in `update_stylesheets'
/home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.4/rails/../lib/sass/plugin/compiler.rb:175:in `each'
/home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.4/rails/../lib/sass/plugin/compiler.rb:175:in `update_stylesheets'
/home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.4/rails/../lib/sass/plugin/compiler.rb:173:in `each'
/home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.4/rails/../lib/sass/plugin/compiler.rb:173:in `update_stylesheets'
/home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.4/rails/../lib/sass/plugin.rb:81:in `update_stylesheets'
/home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.4/rails/../lib/sass/plugin.rb:54:in `check_for_updates'
/home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/sass-3.1.4/rails/../lib/sass/plugin/rack.rb:51:in `call'
/home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/newrelic_rpm-3.1.0/lib/new_relic/rack/browser_monitoring.rb:18:in `call'
/home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/newrelic_rpm-3.1.0/lib/new_relic/rack/developer_mode.rb:24:in `call'
/home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/actionpack-2.3.11/lib/action_controller/string_coercion.rb:25:in `call'
/home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/rack-1.1.2/lib/rack/head.rb:9:in `call'
/home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/rack-1.1.2/lib/rack/methodoverride.rb:24:in `call'
/home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/actionpack-2.3.11/lib/action_controller/params_parser.rb:15:in `call'
/home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/actionpack-2.3.11/lib/action_controller/session/cookie_store.rb:99:in `call'
/home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/actionpack-2.3.11/lib/action_controller/failsafe.rb:26:in `call'
/home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/rack-1.1.2/lib/rack/lock.rb:11:in `call'
/home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/rack-1.1.2/lib/rack/lock.rb:11:in `synchronize'
/home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/rack-1.1.2/lib/rack/lock.rb:11:in `call'
/home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/actionpack-2.3.11/lib/action_controller/dispatcher.rb:114:in `call'
/home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/actionpack-2.3.11/lib/action_controller/reloader.rb:34:in `run'
/home/madhu/.rvm/gems/ree-1.8.7-2011.02@project/gems/actionpack-2.3.11/lib/action_controller/dispatcher.rb:108:in `call'
/home/madhu/.rvm/gems/ree-1.8.7-2011.02@global/gems/passenger-3.0.9/lib/phusion_passenger/rack/request_handler.rb:96:in `process_request'
/home/madhu/.rvm/gems/ree-1.8.7-2011.02@global/gems/passenger-3.0.9/lib/phusion_passenger/abstract_request_handler.rb:513:in `accept_and_process_next_request'
/home/madhu/.rvm/gems/ree-1.8.7-2011.02@global/gems/passenger-3.0.9/lib/phusion_passenger/abstract_request_handler.rb:274:in `main_loop'
/home/madhu/.rvm/gems/ree-1.8.7-2011.02@global/gems/passenger-3.0.9/lib/phusion_passenger/classic_rails/application_spawner.rb:321:in `start_request_handler'
/home/madhu/.rvm/gems/ree-1.8.7-2011.02@global/gems/passenger-3.0.9/lib/phusion_passenger/classic_rails/application_spawner.rb:275:in `send'
/home/madhu/.rvm/gems/ree-1.8.7-2011.02@global/gems/passenger-3.0.9/lib/phusion_passenger/classic_rails/application_spawner.rb:275:in `handle_spawn_application'
/home/madhu/.rvm/gems/ree-1.8.7-2011.02@global/gems/passenger-3.0.9/lib/phusion_passenger/utils.rb:479:in `safe_fork'
/home/madhu/.rvm/gems/ree-1.8.7-2011.02@global/gems/passenger-3.0.9/lib/phusion_passenger/classic_rails/application_spawner.rb:270:in `handle_spawn_application'
/home/madhu/.rvm/gems/ree-1.8.7-2011.02@global/gems/passenger-3.0.9/lib/phusion_passenger/abstract_server.rb:357:in `__send__'
/home/madhu/.rvm/gems/ree-1.8.7-2011.02@global/gems/passenger-3.0.9/lib/phusion_passenger/abstract_server.rb:357:in `server_main_loop'
/home/madhu/.rvm/gems/ree-1.8.7-2011.02@global/gems/passenger-3.0.9/lib/phusion_passenger/abstract_server.rb:206:in `start_synchronously'
/home/madhu/.rvm/gems/ree-1.8.7-2011.02@global/gems/passenger-3.0.9/lib/phusion_passenger/abstract_server.rb:180:in `start'
/home/madhu/.rvm/gems/ree-1.8.7-2011.02@global/gems/passenger-3.0.9/lib/phusion_passenger/classic_rails/application_spawner.rb:149:in `start'
/home/madhu/.rvm/gems/ree-1.8.7-2011.02@global/gems/passenger-3.0.9/lib/phusion_passenger/spawn_manager.rb:219:in `spawn_rails_application'
/home/madhu/.rvm/gems/ree-1.8.7-2011.02@global/gems/passenger-3.0.9/lib/phusion_passenger/abstract_server_collection.rb:132:in `lookup_or_add'
/home/madhu/.rvm/gems/ree-1.8.7-2011.02@global/gems/passenger-3.0.9/lib/phusion_passenger/spawn_manager.rb:214:in `spawn_rails_application'
/home/madhu/.rvm/gems/ree-1.8.7-2011.02@global/gems/passenger-3.0.9/lib/phusion_passenger/abstract_server_collection.rb:82:in `synchronize'
/home/madhu/.rvm/gems/ree-1.8.7-2011.02@global/gems/passenger-3.0.9/lib/phusion_passenger/abstract_server_collection.rb:79:in `synchronize'
/home/madhu/.rvm/gems/ree-1.8.7-2011.02@global/gems/passenger-3.0.9/lib/phusion_passenger/spawn_manager.rb:213:in `spawn_rails_application'
/home/madhu/.rvm/gems/ree-1.8.7-2011.02@global/gems/passenger-3.0.9/lib/phusion_passenger/spawn_manager.rb:132:in `spawn_application'
/home/madhu/.rvm/gems/ree-1.8.7-2011.02@global/gems/passenger-3.0.9/lib/phusion_passenger/spawn_manager.rb:275:in `handle_spawn_application'
/home/madhu/.rvm/gems/ree-1.8.7-2011.02@global/gems/passenger-3.0.9/lib/phusion_passenger/abstract_server.rb:357:in `__send__'
/home/madhu/.rvm/gems/ree-1.8.7-2011.02@global/gems/passenger-3.0.9/lib/phusion_passenger/abstract_server.rb:357:in `server_main_loop'
/home/madhu/.rvm/gems/ree-1.8.7-2011.02@global/gems/passenger-3.0.9/lib/phusion_passenger/abstract_server.rb:206:in `start_synchronously'
/home/madhu/.rvm/gems/ree-1.8.7-2011.02@global/gems/passenger-3.0.9/helper-scripts/passenger-spawn-server:99
*/
body:before {
  white-space: pre;
  font-family: monospace;
  content: "Errno::ENOENT: No such file or directory - getcwd"; }