Issue while accessing process Tab

On Appian 7.10 environment (new environment, there is no rule or process) when we click on Process tab getting popup saying :"The report you requested is invalid or no longer available"
have anyone faced this issue ?

In logs getting below error:
2017-01-17 21:57:33,546 [[ACTIVE] ExecuteThread: '17' for queue: 'weblogic.kernel.Default (self-tuning)'] ERROR com.appiancorp.process.analytics2.display.ReportCache - User Not Found
com.appiancorp.suiteapi.common.exceptions.InvalidUserException: User Not Found
at sun.reflect.GeneratedConstructorAccessor784.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
at com.appiancorp.kougar.mapper.Mapper.prepareThrowable(Mapper.java:144)
at com....

OriginalPostID-258530