Hello, please make sure that's your correct session key (check it for the corresponding service; it should also give you a length error if there is a size mismatch):
https://kemono.cr/importer/tutorialIf you are encountering issues after starting the import, post any part of your import log ID (NOT your session key!) and I'll forward it to SA. Or you can just post the whole import log ID if you want someone else to help troubleshoot.