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Rename Modpack Configuration Checker-1.12.2-v1.9.0.jar to Modpack Configuration Checker-1.12.2-v1.9.0.jar.disabled and it will start up. Seems the modpack config checker is meant for clients not the server.
Rename Modpack Configuration Checker-1.12.2-v1.9.0.jar to Modpack Configuration Checker-1.12.2-v1.9.0.jar.disabled and it will start up. Seems the modpack config checker is meant for clients not the server.