I assume the Prisma is running VE11, not XA30. It sounds like some anonymization tool removed the CSA header from your DICOM files. The CSA header contains a lot of crucial details about your sequence
  https://nipy.org/nibabel/dicom/siemens_csa.html
I suggest you check the provenance of the DICOM files, and determine what tool removed your sequence details. You can always export your DICOM files directly off the scanner console to avoid these issues.