err3

`secret` option required for sessions

Error: `secret` option required for sessions
    at session (/home/graeme/textshots/node_modules/express-session/index.js:157:23)
    at Layer.handle [as handle_request] (/home/graeme/textshots/node_modules/express/lib/router/layer.js:82:5)
    at trim_prefix (/home/graeme/textshots/node_modules/express/lib/router/index.js:270:13)
    at /home/graeme/textshots/node_modules/express/lib/router/index.js:237:9
    at Function.proto.process_params (/home/graeme/textshots/node_modules/express/lib/router/index.js:312:12)
    at /home/graeme/textshots/node_modules/express/lib/router/index.js:228:12
    at Function.match_layer (/home/graeme/textshots/node_modules/express/lib/router/index.js:295:3)
    at next (/home/graeme/textshots/node_modules/express/lib/router/index.js:189:10)
    at SendStream.error (/home/graeme/textshots/node_modules/express/node_modules/serve-static/index.js:106:7)
    at SendStream.emit (events.js:95:17)