@silentguy/Ian - I just downloaded your Similar Stories plugin to have a look at the source. The cause is undoubtedly just a copy/paste error in action.py. It should be referencing your *own* common_utils file, not the one in the find duplicates plugin.
i.e. Change this:
from calibre_plugins.find_duplicates.common_utils import set_plugin_icon_resources, get_icon, \
to this:
from calibre_plugins.similar_stories.common_utils import set_plugin_icon_resources, get_icon, \
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