Error message examples
The CachingMethod attribute of ComputedByCalculator is configured to never cache results, but ComputedByCalculator is defined as a ComputedBy side-effect of another variable. As a side-effect, it must be cached, otherwise the result cannot be retrieved.
You have set the CachingMethod of the variable that is computed by another object to "Never store any", which is not allowed.
Change the Caching Method of the mentioned variable to "Always store results."