“You are using an old version of the Fidesic eInvoice and ePay Module.”
This error can have two causes.
1. Your module is out of date. Please contact fidesic support for an updated module and installation instructions.
2. You have tables remaining from a recent upgrade.
GP -> Maintenance -> SQL, select db and product “eInvoice and ePay”, select table FI_Version, check the “drop table” checkbox, process, and restart GP as SA.
This will drop all previous tables.