Can confirm, having the same issue on torch dedicated server:
Exception in TBC202C_L AnimationsSet: System.NullReferenceException: Object reference not set to an instance of an object.
at CoreSystems.Platform.Weapon..ctor(MyEntity entity, WeaponSystem system, Int32 partId, WeaponComponent comp, RecursiveSubparts parts, MyEntity elevationPart, MyEntity azimuthPart, MyEntity spinPart, String azimuthPartName, String elevationPartName)
09-22-23_13-35-44-835 - PlatformCrash: TBC202C_L - Your block subTypeId (TBC202C_L) Invalid weapon system - id: - partCount:2 - modContext:1918681825.sbm[WeaponCore - 2.4], check to make sure you don't have duplicate partnames in your mod, I am crashing now Dave.
09-22-23_13-35-44-835 - PlatformCrash: TBC202C_L - Platform PreInit is in an invalid state: TBC202C_L

Got it running by editing the TBC202 C# Script, but Kinetic- and Railgun-Weapons are broken too. No inventory space to load ammo, no ai range. Additionally it seams like one type of ammunition is missing for the new Skofnung ( or the AP type is default ).

I'm having the same issues, crashes related to the TBC202C_L, and certain rail and kinetic weapons wont pull their respective ammo. The ammo issue appears to be due to a naming error with the various allowed ammo types by the turrets.

Problem causing WC to crash due to installing TBR202 or TBC202 and the problem with non-unique names fixed with the latest update
Skofnung currently has only 1 ammo variant

Currently only Railguns have a loading problem and we are working on a patch to fix it