Your #fast custom column is for FAST Tags. You created one that is NOT tag-like. So, when Calibre 'Metadata Edit' invoked by LC tries to update your #fast custom column with a
list of tags, it fails.
Code:
FAST: [u'Psychotherapy', u'Shame']
Delete your #fast custom column, and then recreate it as a proper tag-like column.
Note that the LCEAD Extra Author Details column is always tag-like too.
LC will automatically create the proper custom columns for you (if you have not already manually created them) if you click the button to do so.
DaltonST