Getting Error: com.appiancorp.suiteapi.common.exceptions.InvalidUserException: User does not exist

Hello,

When I'm trying to login using different users, most of the time I'm getting pink pop-up Saying "A Server error encountered while processing your request. Please try again".
When I checked server logs there is below exception. Also User is present in environment when I check from designer. After multiple tries I'm able login using that user. Some times if I try to login using same user from different machine it works first time it self.

2017-02-21 15:46:40,681 [[ACTIVE] ExecuteThread: '23' for queue: 'weblogic.kernel.Default (self-tuning)'] ERROR com.appiancorp.security.auth.AppianPortalSessionAuthenticationStrategy - com.appiancorp.suiteapi.common.exceptions.InvalidUserException: User does not exist
com.appiancorp.suiteapi.common.exceptions.InvalidUserException: User does not exist
at sun.reflec...

OriginalPostID-265677