I played my VV , then after 20 hours i didnt play , i open
then when then I click Play
A dIalogue Appears that Says , please enter a nickname
Answer Me , LDW
My Tribe Now Is Not Going Well , please help!
I need It,
Thank You For Your Kind Consideration

There is no known glitch that could cause that. Those kinds of problems are usually caused by circumstances outside the game. There are two answers in our Support FAQ that might help you:

Answer 1

Answer 2