kong test error

vagrant@precise64:/kong$ busted -v spec/plugins/ssl/
✱●
1 success / 0 failures / 1 error / 0 pending : 1.658963 seconds

Error → /usr/local/share/lua/5.1/ngx/ssl.lua @ 5
suite spec/plugins/ssl/access_spec.lua
/usr/local/share/lua/5.1/ngx/ssl.lua:5: module 'resty.core.base' not found:No LuaRocks module found for resty.core.base
	no field package.preload['resty.core.base']
	no file './resty/core/base.lua'
	no file '/home/vagrant/.luarocks/share/lua/5.1/resty/core/base.lua'
	no file '/home/vagrant/.luarocks/share/lua/5.1/resty/core/base/init.lua'
	no file '/usr/local/share/lua/5.1/resty/core/base.lua'
	no file '/usr/local/share/lua/5.1/resty/core/base/init.lua'
	no file './resty/core/base.lua'
	no file '/usr/local/share/luajit-2.0.4/resty/core/base.lua'
	no file './csrc/resty/core/base.so'
	no file './csrc/resty/core/base/resty/core/base.so'
	no file '/home/vagrant/.luarocks/lib/lua/5.1/resty/core/base.so'
	no file '/usr/local/lib/lua/5.1/resty/core/base.so'
	no file './resty/core/base.so'
	no file '/usr/local/lib/lua/5.1/loadall.so'
	no file './csrc/resty.so'
	no file './csrc/resty/resty.so'
	no file '/home/vagrant/.luarocks/lib/lua/5.1/resty.so'
	no file '/usr/local/lib/lua/5.1/resty.so'
	no file './resty.so'
	no file '/usr/local/lib/lua/5.1/loadall.so'

stack traceback:
	/usr/local/share/lua/5.1/ngx/ssl.lua:5: in main chunk