and i installed open journal system OJS by softaculous
but when using it i cant upload or submitted any file the following message appeared " The file could not be uploaded or revised.
and also can’t change the theme the following message appeared
" The form was not saved because 1 error(s) were encountered. Please correct these errors and try again. "
got in the theme name
This is not a valid string.
please help me
thank you in advance