1 parameter, 2 given in ... after migrating from localhost

Question

I've moved my website live and I'm getting error.

1 parameter, 2 given in ... on line 57

The line is exactly:

file_put_contents( $files['owg'], json_encode( $data, true ) );

The whole thing is:

if( isset( $_POST['submit'] ) ) {
 if ( !empty( $_POST['owg'] ) ) {
    $data['owg'] = nl2br( trim( $_POST['owg'] ) );
    file_put_contents( $files['owg'], json_encode( $data, true ) );
    unset( $data );
  }
}

Chmods are 777 on files and folders. Why is this error not appearing at localhost?