I create my own modpack for server and:

1. I have crash from BOP dynamic trees addon. I was force to delete this addon.

crash-reports.zip

2. BOP did not work on server, when i delete normal world file, change level-type on BIOMESOP it creates normal vanilla world. I have not biomsoplenty config file in config folder.

I use BiomesOPlenty-1.12.2-7.0.1.2441-universal.jar on server and client modpack

We do not support 1.12 anymore, and any issues with the Dynamic Trees add-on is going to be on their end. BOP doesn't not interact with it at all