Calendar disappeared entirely

Calendar disappeared entirely

by Sa Ra -
Number of replies: 0

I deleted a course from a course category and it caused the calendar to disappear entirely. In the place of where the calendar used to be is the following error: Can not find data record in database table course. 

I am just a Moodle administrator, not a developer. Can any developers please tell me if this is a major issue or is it easily fixed? I am quite worried.

Any advice? Thanks a million.

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