Game crashes when using any of the Shoppy blocks's buttons (bartering/shop)

[juanzandev]

Forge version: 49.0.14
Game version: 1.20.4
EpheroLib version: 1.2.0
Shoppy version: 1.1.1
Error messages:

The game crashed whilst mouseclicked event handler
Error: java.lang.IllegalArgumentException: Invalid message com.epherical.shoppy.networking.packets.SetPrice

The game crashed whilst mouseclicked event handler
Error: java.lang.IllegalArgumentException: Invalid message com.epherical.shoppy.networking.packets.SlotManipulation

Game crashes giving similar error messages for every one of the buttons on every GUI.

[juanzandev]

I just tested in the latest forge version, 49.0.38, and I have been getting the same error.

[Adorkieble]

We're having the same issue on my server. nobody can use the blocks without crashing their game.

[MJRamon]

Another critical issue