One of the staff has this error while login to NAV, the error isn't fatal as he still can operate NAV, however it's quite annoying to him.
I suspect this error involved his user personalization. However this error happened to him only, other staff with same user access and role id didn't have this issue.
Can you suggest or help what i should check ? Help will be appreciated. Thank you. :D
Try to run it with the debugger turned on to "Next Error" when he logs in. Then you'll see what happens.
Did you do the synchro?