[Tuntun]

[14:25:10] Loaded.
[14:25:10] Loading plugin: whirlpool.so
[14:25:10] Failed (plugins/whirlpool.so: cannot open shared object file: No such file or directory)
[14:25:10] Loaded 4 plugins.

[mixmadamich]

You maybe don't have whirlpool.so in your plugins folder.
If that didn't help try to delete the .so in the server.cfg

[Necip]

Change "whirlpool.so" to "Whirlpool.so"(the W must be capital).