Strange error when migrating XML1-based sdlftsettings files to XML2-based sdlftsettings

Question

We need to migrate XML1-based sdlftsettings files to XML2-based sdlft settings files in Trados Studio 2024 using the procedure as described under the link below. 
 gateway.sdl.com/CommunityKnowledge 
 When doing so for a set of 3 sdlftsettings files, we get the error message below. The error occurs between step 5 (Namespaces) and step 6 (Parser Rules). The only thing we can do is click away the error message. Next, all parser rules seem to migrate correctly, but due to the red cross present in each cell in the 1st column (Details) we cannot click Next and complete the migration.

No information on this error message to be found anywhere.

Paul · Answer

Guido Vermeer 
 If you have one of the old settings files I'd be happy to take a look and see if I can help with that? You can send it to pfilkin at sdl dotcom

Edith Wagner · Answer

Hi Guido Vermeer , the issue is caused by the "fct:ExternalLink" parser rule, as it references a namespace that was not added under Namespace mapping in the filter settings. As this should not prevent you from migrating the filter, I logged the issue for our Development (as CRQ-40344), so it can be fixed in the future.

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Strange error when migrating XML1-based sdlftsettings files to XML2-based sdlftsettings