When I backup a course with Quizzes and ddmatch questiontype and restore it on a different installation the ddmatch questions are not there.

1. I made a backup of just one Quiz (without user information) with one ddmatch question, downloaded and unzipped the backupfile but couldn't see something missing. All backupfiles and also the files with the pictures are there.
2. I restored it into an existing course on my lokal installation and when I try to attempt the Quiz there are no questions and no answers. The error is:
Notice: Undefined index: in /home/kkrueger/moodle/question/type/ddmatch/renderer.php on line 95 Notice: Undefined property: qtype_ddmatch_question::$choiceformat in /home/kkrueger/moodle/question/type/ddmatch/renderer.php on line 97 Notice: Undefined index: in /home/kkrueger/moodle/question/type/ddmatch/renderer.php on line 218 Notice: Undefined property: qtype_ddmatch_question::$stemformat in /home/kkrueger/moodle/question/type/ddmatch/renderer.php on line 218 Notice: Undefined index: in /home/kkrueger/moodle/question/type/ddmatch/renderer.php on line 95 Notice: Undefined property: qtype_ddmatch_question::$choiceformat in /home/kkrueger/moodle/question/type/ddmatch/renderer.php on line 97

3. When I look into the question bank the question is not there.