LogCook: Error: Content is missing from cook. Source package referenced an object in target package but the target package was marked NeverCook or is not cookable for the target platform.

I managed to fix a few of my assets with this issue by

  1. Marking the variable with the error as editor only compiling.
  2. Unticking editor only and compiling agian.
    3.Packaging/Cooking Content agian.