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xe/modules/msg_admin/msg_admin.admin.view.php
파일에서,

13번째 주석부터, 16번째줄 아래 내용을 삭제합니다
 

// 커뮤니케이션 애드온이 활성화 되어있는지 검사
$oAddonAdminModel = &getAdminModel('addon');
$communication_check = $oAddonAdminModel->isActivatedAddon("member_communication");
if(!$communication_check) return $this->stop('communication_addon_null');