I get this error when I launch MC with PhysicsMod ,MrCrayFish's Gun Mod and Obfuscate.
The problem seems to be solved when I remove Obfuscate and MrCrayFish's Gun Mod from the mods folder so i think PhysicsMod and Obfuscate are in some way incompatible.

Versions used are :
+Obfuscate-0.6.3-1.16.5
+physics-mod-2.6.5-1.16.5(also tried with 2.6.7 and 2.6.9 but the same thing occurred)

Here is the crash report : https://pastebin.com/xdiU1k45

Also having this crash.

same thing here