We are preparing the Nintex 2010 to 2013 migration.
When using Aarons tool Workflow Migration Preparation Tool to figure out the potential claims migration problems the tool logs a lot of "Workflow Association not found for <workflow name>" errors .
I checked some of those workflows and the problem seems that these workflows have been deleted while there are still items with a workflow history regarding the deleted workflows or even running instances of the workflows.
Could any of you please tell me how to fix this e.g. how to remove all the information of the deleted workflows.