TypeError: Cannot read property 'sampleQuestions' of undefined
   at /var/app/current/classes/olympiadQuestionsRoutes.js:156:31
   at Layer.handle [as handle_request] (/var/app/current/node_modules/express/lib/router/layer.js:95:5)
   at next (/var/app/current/node_modules/express/lib/router/route.js:149:13)
   at Route.dispatch (/var/app/current/node_modules/express/lib/router/route.js:119:3)
   at Layer.handle [as handle_request] (/var/app/current/node_modules/express/lib/router/layer.js:95:5)
   at /var/app/current/node_modules/express/lib/router/index.js:284:15
   at param (/var/app/current/node_modules/express/lib/router/index.js:365:14)
   at param (/var/app/current/node_modules/express/lib/router/index.js:376:14)
   at param (/var/app/current/node_modules/express/lib/router/index.js:376:14)
   at param (/var/app/current/node_modules/express/lib/router/index.js:376:14)