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Error: no definition found for profile UNKNOWN.

Reason

A profile that was missing from the project was not replaced (most likely "OFF" - see related question) and the project 
then saved. This would cause an invalid "UNKNOWN" profile to be recorded.
 
Resolution
 
To resolve this problem we must introduce a new weekly modulating profile with the reference ID "UNKNOWN".
Step-by-step 
  1. Open Profiles editor. 
  2. Create a new weekly modulating profile. 
  3. Assign ID “UNKNOWN”.
  4. Set all daily profiles to be 'Always off'. daily profile. (this is default setting so should not have to change).