An exception occurred when setting data

Sponge Sponge Support
1

Found in the log the following:

from fml-server-2.log

forge-1.8.9-11.15.1.1890-1.8.9-universal.jar
spongeforge-1.8.9-1890-4.2.0-BETA-1586.jar

2

This appears to be an issue with ActionControl.

3

You are right! Without it working correctly.