android studio problem after installing kotlin plugin

hi,

i installed kotlin plugin and i have some problem:

1) if i try to disainstall kotlin plugin fram android studio setting plugin. I cannot reopen android studio because missing important plugin. Ans ask me to réinstal android studio. (i found a way to make android studio work but not to aninstall kotlin.

2) after kotlin plugin installation i cannot modified the editor color sheme. The apply button never show this possibility. And the java file are colored with the kotlin color sheme and not anymore with the java color sheme.

Thank to explain to me what shall i do to get the editor color sheme back to java.

thanks.