Error upon logging in to Appian

Certified Senior Developer

I have installed appian 16.2 with jboss6.4 and MySQL 5.6 . When I try to access designer localhost:8080/.../designer it throws error : "The report you have requested is invalid or no longer available",Attached screen shot.
I have followed all the steps in installation guide and verified custom.properties & web.xml(disabled https).

I see below errors in log file (file in question navigation-config.xml is present and valid)
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11:21:17,951 INFO [stdout] (ServerService Thread Pool -- 141) 2016-04-15 11:21:17,951 [ServerService Thread Pool -- 141] ERROR com.appiancorp.common.config.ConfigObject - An error occurred while trying to initialize the config object com.appiancorp.common.initialize.MigrateNavigationConfig using the following resources: /WEB-INF/conf/dataload/navigation/navigation-config.xml
11:21:17,954 INFO [stdout] (ServerService Thread Pool -- 141) java.lang.NullPointerExcep...

server.log

OriginalPostID-214110

OriginalPostID-214110

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