[Resolved] Fatal Error: SDM Debug not found

um, we are in a hurry of our development, but after we test the code… we received this fatal error:

Fatal error: Uncaught Error: Class ‘SDM_Debug’ not found in /home2/ohwowmar/public_html/nasis/wp-content/plugins/sdm-squeeze-form/sdm-sf-shortcodes.php:51 Stack trace: #0 /home2/ohwowmar/public_html/nasis/wp-includes/class-wp-hook.php(286): sdm_sf_check_submission(”) #1 /home2/ohwowmar/public_html/nasis/wp-includes/class-wp-hook.php(310): WP_Hook->apply_filters(Object(RegenerateThumbnails), Array) #2 /home2/ohwowmar/public_html/nasis/wp-includes/plugin.php(453): WP_Hook->do_action(Array) #3 /home2/ohwowmar/public_html/nasis/wp-settings.php(450): do_action(‘init’) #4 /home2/ohwowmar/public_html/nasis/wp-config.php(101): require_once(‘/home2/ohwowmar…’) #5 /home2/ohwowmar/public_html/nasis/wp-load.php(37): require_once(‘/home2/ohwowmar…’) #6 /home2/ohwowmar/public_html/nasis/wp-blog-header.php(13): require_once(‘/home2/ohwowmar…’) #7 /home2/ohwowmar/public_html/nasis/index.php(17): require(‘/home2/ohwowmar…’) #8 {main} thrown in /home2/ohwowmar/public_html/nasis/wp-content/plugins/sdm-squeeze-form/sdm-sf-shortcodes.php on line 51

We are launching marketing campaign to our site any time today.. Please help.