Graviex has updated their wallet to the latest iBTC code:

https://github.com/NullFunctor/iBTC/releases/tag/v0.19.1.2_final

All mining pools and users must update their wallets to this version if they want to be on the latest chain and have access to the iBTC Graviex wallet.

Rename your existing .iBTC folder to .iBTC_OLD prior to running the new iBTC node.