java - making changes in the lift app in eclipse -

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i working lift webframe work integrated eclipse. have downloaded 1 sample app github , i'm trying add more lines it. if error occured in project, localhost:8080 showing errors after have fixed them. after making each changes used stop , start server. error still showing:

   exception occured while processing /   message: java.lang.noclassdeffounderror: not initialize class code.lib.dependencyfactory$ code.snippet.helloworld.date(helloworld.scala:12) code.snippet.helloworld$$anonfun$howdy$1.apply(helloworld.scala:15)    .......    .......    .......

i've tried revert changes made me initial state of example project, without luck.

what can this?


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