studiomdl.exe threw me this error when trying to recompile, after decompiling with no errors in crowbar:
Compiling with Crowbar 0.72: "C:\Users\brann\Downloads\New folder\v_mp5.qc" ...
Compiling "v_mp5.qc" ...
Output from compiler "E:\SteamLibrary\steamapps\common\Half-Life SDK\Model Tools\studiomdl.exe":
entering v_mp5.qc
********** ERROR **********
/mp5sd.smd.smd doesn't exist
CROWBAR: Deleted empty temporary compile folder "C:\Users\brann\Downloads\New folder\valve".
... Compiling "v_mp5.qc" finished. Check above for any errors.
... Compiling with Crowbar 0.72: "C:\Users\brann\Downloads\New folder\v_mp5.qc" finished.