"End of file reached" error

I uesd the Pokemon essentials v11,but when i choose the "continue" ,there would appear a massagebox like this,why?And when i choose the"New Game",this massagebox would nox appear,and if i choose the"continue",it did not also appear,but if i choose the "Language" to change the language of the game,the bug will appear again,why?Who can help me to repair the BUG?Thanks!View attachment 71832

First question: Is your copy of Essentials unmodified? if not, what changes have you made to it