when im choosing a character and start the game its fine but after go back to choose character and choose different character its crashing im looking for crash logs where can i find them? can someone tell me with details? thanks.

I don't believe theres automatic log, you can do it yourself, or in debug check the callstack of before the crash

i found the crash problem with much tries
crash is because of memory leaking when im spamming re-join the game is not loading my character.

I need a put a Loading screen when shutgame() function is calling..
in Esenthel MMO / game.script

i added in shutgame() function
these codes:
BL means BackgroundLoader thats in another script. (Background Loader)

but loading screen is not appearing..

Not getting what you are saying sorry.
And once again youre code shows nothing but 2 functions called

Think about it not as unity scripts, but as C++ application with simplified header-source interaction. If you don't add any logs, there will be none.

I suggest you start with adding APP_BREAKPOINT_ON_ERROR flag and run your project from Visual Studio in debug mode, you will see the crash and call stack.