A problem with starting server

Server Discussion
1

Server can’t start, it stucks.

Version information:
forge-1.12.2-14.23.5.2825-universal
minecraft_server.1.12.2
spongeforge-1.12.2-2825-7.1.6
SpongeBootstrap-0.7.0

Logs:
debug.log

Please help!

2

How much longer did you wait for the server to start, past the time of the last line in the log.

If all else fails, make a backup for the server, and try upgrading sponge (and forge if possible).

3
  1. I wait 15 minutes.
  2. I’m upgraded forge and sponge, but server still stuck.
  3. Default forge server start successfully.

Update: flans mod causes server to stuck. Can I fix it?