I had the same issue and for me it helped to make the following change in the file UE_5.6\Engine\Plugins\Animation\DNACalib\DNACalib.uplugin.
Original:
{
“Name”: “DNACalibModule”,
“Type”: “Runtime”,
“LoadingPhase”: “Default”
}
Changed:
{
“Name”: “DNACalibModule”,
“Type”: “Editor”,
“LoadingPhase”: “Default”
}
I hope this also helps others.