Version was updated to from "2.14.0" to "2.15.1"
An update/modif to c4ce665 is needed

It's not that simple. After v0.3.0 the core RCLootCouncil version should not be sent, so the only real reason this could be happening is if someone has installed the retail version - which in itself doesn't run on Classic.

Well, turns out not being in a guild in Classic was the real issue. evil-morfar/RCLootCouncil2@9f99b8c - thanks for your report.