I have been playing on a server with my friends for a while using curseforge. All of a sudden the other night i cannot go into a specific room we built. I comes up with the following error:

 

[Server thread/WARN] [Canary Class Analysis/]: Canary Class Analysis Error: Class com.talhanation.smallships.entities.AbstractCannonShip cannot be analysed, because getting declared methods crashes with NoClassDefFoundError: com/mojang/blaze3d/vertex/PoseStack. This is usually caused by modded entities declaring methods that have a return type or parameter type that is annotated with @OnlyIn(value=Dist.CLIENT). Loading the type is not possible, because it only exists in the CLIENT environment. The recommended fix is to annotate the method with this argument or return type with the same annotation. Canary handles this error by assuming the class cannot be included in some optimizations.

 

I have reinstalled the modpack profile many times to no avail. Any help would be greatly appreciated!

Post your logs/debug.log from the server so we can see the actual problem.

From the information you show, the canary mod is trying to load a client class on the server, specifically by loading a class from the smallships mod that references a client class.

But the warning suggests this is not the real problem.