Working on Remote server - Error

Hi, i upload my script to PHP (v 5.3.29) server;
I get Ajax errors - 500 (Internal Server Error) ;

So i figured out the issue;

when i write like this everything is fine, there is no problem;

//if edit mode and password is blank, do not save.
    $editor->on( 'preEdit', function ( $e, $id, $values ) {
    if ( $values['users']['user_pass'] === '' ) {
    $e->field( 'users.user_pass' )->set( false );
    }
    } );


    //if create - validate for pass
    $editor->on( 'preCreate', function ( $editor, $values ) {
    $editor->field( 'users.user_pass' );
    $editor->validator( 'Validate::notEmpty' );
    } );

but in my original script in localhost, the code is like below;

    //if edit mode and password is blank, do not save.
    ->on( 'preEdit', function ( $e, $id, $values ) {
    if ( $values['users']['user_pass'] === '' ) {
    $e->field( 'users.user_pass' )->set( false );
    }
    } )


    //if create - validate for pass
    ->on( 'preCreate', function ( $editor, $values ) {
    $editor
    ->field( 'users.user_pass' )
    ->validator( 'Validate::notEmpty' );
    } );

so is there a way to make the original code work on remote server without any changes? Cause i have to update so many rows.
Thanx