After upgrading Nintex Workflow, the following error might occur when running a Flexi Task action:

Run these commands in order:

stsadm.exe -o installfeature -n NintexWorkflowContentTypeUpgrade -force stsadm.exe -o activatefeature -name nintexworkflowcontenttypeupgrade -url http://sitecollection -force

There was an error installing the content type required for the Flexi task action. Please arrange for an Administrator to run the following command on the server: stsadm.exe -o installfeature -n NintexWorkflowContentTypeUpgrade For more information please contact support@nintex.com.