remaining ddebug_backtrace() in mcapi.controller

installation of mcapi_webforms mcapi_mail mcapi_limits_equation mcapi_currencies mcapi_services mcapi_views failed due to the following error :

root@vps10351:/var/www/drupal.mirlitone.com/htdocs/sites/all/modules# drush pm-enable mcapi_webforms mcapi_mail mcapi_limits_equation mcapi_currencies mcapi_services mcapi_views
The following projects have unmet dependencies:
mcapi_services requires services
Would you like to download them? (y/n): y
Project services (7.x-3.1) downloaded to /var/www/drupal.mirlitone.com/htdocs/sites/all/modules/services.                                                                                                                         [success]
The following extensions will be enabled: mcapi_webforms, mcapi_mail, mcapi_limits_equation, mcapi_currencies, mcapi_services, mcapi_views, services
Do you really want to continue? (y/n): y
PHP Fatal error:  Call to undefined function ddebug_backtrace() in /var/www/drupal.mirlitone.com/htdocs/sites/all/modules/mutual_credit/mcapi.controller on line 67
Drush command terminated abnormally due to an unrecoverable error.                                                                                                                                                                [error]
Error: Call to undefined function ddebug_backtrace() in /var/www/drupal.mirlitone.com/htdocs/sites/all/modules/mutual_credit/mcapi.controller, line 67