I know, I know. You've seen this error a thousand times before but I've been looking for a solution and I cannot find anything so I thought id ask for help. Here is my situation:

My map started as a basic box map for weapons/perk testing. I had no errors at this point. My plan was to copy my actual map (which I had made before) into my test map and carry on from there. When I did this, I got the 400fx error. All the things I did between compiles had nothing to do with FX. So this brings me to my question, does map size affect FX count in some way? Thanks to UGX Asset Counter, I checked the total fx being loaded into my map. The total is only 335 FX. The files I loaded into Asset Counter are:

code_post_gfx.csv
common.csv
default.csv
localized_common.csv
mod.csv
nazi_zombie_a_town.csv
nazi_zombie_a_town_patch.csv
patch.csv     

Is there anything else that I should be adding to this list to check that my map loads? It is also notable that I have exceeded the weapon limit (188 of max 128) however, before I pasted my actual map, there were no errors.

no

You could have gone over with your weapon files, the fx used in there maybe, if you have that many. Just follow one of the tuts on ignoring fx, after fixing your weapon file issue, and be sure to delete the nazi_zombie_mapname in your activision folder before building mod again.

I'm not sure how that asset counter works so... Not sure if weapons were included in the count, but I would think they were...

I actually fixed this problem. I just made most of the regular weapons use the same muzzleflash, and all upgraded weapons use the same muzzleflash (Except wonder weapons, launchers, ect.) Also comented out a bunch of fx in random places. Thanks for the reply though

it tells you how many weapons are loaded, but im not sure if it takes the FX used on them into account

You probably should try to reduce a few more, just in case you decide later to add some effects for a wonder weapon or something. I like to have a bit of free room, up to you