did you do this?
[BUG] Open ServerStart.bat and change the forge version to forge-1.7.10-10.13.2.1277 instead of forge-1.7.10-10.13.2.1272. If you are using Java 7, capitalize the 'P' in "permSize=256m". If you are using Java 8, remove the "permSize=256m" altogether. Then run StartServer.bat -...