Which mods stop that our server will work

What is the best way to discover which mod is stoping my server to work well. We just made a new dedicated server with different mods, mostly structural but i cant connect to the server - New/Old Root size mismatch! - thats the only info from console and i really wanted to know if there is a good way to figure out "bad" mods in a mod pack. would appreciate every possible help!

/edit, the modpack works in singleplayer without issues
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