TypeError: Cannot read property 'length' of undefined
at Docset._loadCourseIndex (/home/doc/cw-app/lib/Docset.js:51:20)
at new Docset (/home/doc/cw-app/lib/Docset.js:14:20)
at /home/doc/cw-app/lib/doc-route.js:63:18
at Layer.handle [as handle_request] (/home/doc/cw-app/node_modules/express/lib/router/layer.js:82:5)
at next (/home/doc/cw-app/node_modules/express/lib/router/route.js:100:13)
at Route.dispatch (/home/doc/cw-app/node_modules/express/lib/router/route.js:81:3)
at Layer.handle [as handle_request] (/home/doc/cw-app/node_modules/express/lib/router/layer.js:82:5)
at /home/doc/cw-app/node_modules/express/lib/router/index.js:234:24
at param (/home/doc/cw-app/node_modules/express/lib/router/index.js:331:14)
at param (/home/doc/cw-app/node_modules/express/lib/router/index.js:347:14)
at param (/home/doc/cw-app/node_modules/express/lib/router/index.js:347:14)
at param (/home/doc/cw-app/node_modules/express/lib/router/index.js:347:14)
at param (/home/doc/cw-app/node_modules/express/lib/router/index.js:347:14)
at Function.proto.process_params (/home/doc/cw-app/node_modules/express/lib/router/index.js:391:3)
at /home/doc/cw-app/node_modules/express/lib/router/index.js:228:12
at Function.match_layer (/home/doc/cw-app/node_modules/express/lib/router/index.js:295:3)