Strange Error - Meta, idlist, Feat?
 

I've reported this as a bug, but I wondered if anyone else has seen this or can make sense of it.
Nearly everytime I either - Click on the Feat tab, click on 'Add New Feat' or select a Feat, (Sometimes all three), I get an error that says:

thing 'Meta' in idlist does not exist
Location: 'pre-requisite rule' script for Component Set 'Feat' near line 111
- - -
'foreach thing in idlist' does not have any valid thing ids
Location: 'pre-requisite rule' script for Component Set 'Feat' near line 111
- - -
thing 'Meta' in idlist does not exist
Location: 'pre-requisite rule' script for Component Set 'Feat' near line 111
- - -
'foreach thing in idlist' does not have any valid thing ids
Location: 'pre-requisite rule' script for Component Set 'Feat' near line 111
- - -
thing 'Meta' in idlist does not exist
Location: 'pre-requisite rule' script for Component Set 'Feat' near line 111
- - -
'foreach thing in idlist' does not have any valid thing ids
Location: 'pre-requisite rule' script for Component Set 'Feat' near line 111

This happens in multiple portfolios of my creation. It happened before the last PF update and is still occuring. I can just click past it and continue but it getting really annoying. I can't find anything in my user files that uses idlist or Meta. GSR locates an 'idlist' in data.hlz
Any ideas?