Error 500 when entering a wrong login or password ! - Joomla! Forum - community, help and support

hello,
when type username or incorrect password still have following errors:

- 500 (in frontend)

frontend.jpg

- 500 - error has occurred (in backend)

backend.jpg

thank in advance.

i've found solution myself.

the below directories must writable(757 or 777 example).
./cache
./logs
./tmp

thanks lot.