Note: You are currently viewing documentation for Moodle 3.3. Up-to-date documentation for the latest stable version of Moodle is probably available here: error/qtype combined/nosubquestiontypesinstalled.
In order for the Combined question type to work, You need to have installed in your Moodle server two or more of the following four additional question types:
- Numeric (n.b. based on Variable numeric and not Numerical)
- Pattern match
- OU multiple response
- Select missing word
Please install two or more of these additional plugins from the Moodle plugins database and try again.