Getting WordPress admin login error massage, Refer the below solutions.
You can easily achieve that by adding the following line to your themes ‘functions.php’ file.
add_filter(‘login_errors’,
create_function(‘$no_login_error’,
“return ‘Oops! Wrong Credentials.’;”));
The second argument to the ‘add_filter’ creates a anonymous callback function. This is equivalent to the following.
function no_login_error() {
return ‘Oops! Wrong Credentials.’;
}
add_filter(‘login_errors’,’no_login_error’);
Note:This way you can change WordPress admin login error message.