Server crash on vanilla commands

Hi there,

When I use vanilla commands like /gamemode, /tp, /… the server crashes, and don’t give any crash report file.
Does anyone know why this is happening.
I’m using the latest stable 1.12.2 sponge version with forge forge-1.12.2-

thanks for your help

You are using an outdated version of Forge. The latest SpongeForge requires at least Forge version 2611, which should be pretty clear from the name of the file (1.12.2-2611-7.1.0-BETA-2931).

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