12:56:29] [Server thread/WARN] [FML]: Forge Mod Loader detected that the backup level.dat is being used.
This may happen due to a bug or corruption, continuing can damage
your world beyond repair or lose data / progress.
It's recommended to create a world backup before continuing.
Run the command /fml confirm or or /fml cancel to proceed.
Alternatively start the server with -Dfml.queryResult=confirm or -Dfml.queryResult=cancel to preselect the answer.
This may happen due to a bug or corruption, continuing can damage
your world beyond repair or lose data / progress.
It's recommended to create a world backup before continuing.
Run the command /fml confirm or or /fml cancel to proceed.
Alternatively start the server with -Dfml.queryResult=confirm or -Dfml.queryResult=cancel to preselect the answer.
输入 /fml confirm 即可解决 还有麻烦去https://www.mcbbs.net/forum-multiqanda-1.html发