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jQuery(document).bind('gform_post_render', function (event, formId, current_page) {
    if (formId == 1) {
        for (var key in gfMultiFileUploader.uploaders) {
            gfMultiFileUploader.uploaders[key].bind('FilesAdded', function (up, files) {
                var img_field_key = up.settings.container;
                jQuery('#' + img_field_key).find('.ginput_preview').addClass('hello');
                if (jQuery('#' + img_field_key).parents('li').find('.validation_message').find('ul').find('li').length > 0) {
                    console.log('has error');
                    jQuery('#' + img_field_key).parents('li').removeClass('gfield_error');
                    jQuery('#' + img_field_key).parents('li').find('.validation_message').hide();
                }
                jQuery('#' + img_field_key).parents('li').find('.validation_message').find('ul').empty();
            });
        }
    }
});