So when i grab the cannons it will move but when i try to fire theres no sound, no shell ejecting, no bullet, but there is camera shake. And here is the errors it showed me in the console:

[ERROR] lua/entities/gb_mortar_cache.lua:195: Tried to use a NULL physics object!
1. SetMass - [C]:-1
2. ReconfigureWeight - lua/entities/gb_mortar_cache.lua:195
3. unknown - lua/entities/gb_mortar_cache.lua:237


[ERROR] lua/autorun/avp_predator_manager.lua:27: Tried to use a NULL entity!
1. SetMaterial - [C]:-1
2. unknown - lua/autorun/avp_predator_manager.lua:27


And when i try to aim the MG's it like does it very laggy and slow.
And here is the error that the console shows me when i try to aim it:


[Gredwitch's Emplacement Pack] lua/entities/gred_emp_base/init.lua:352: Calling net.Start with unpooled message name! [ http://goo.gl/qcx0y ]
1. Start - [C]:-1
2. unknown - lua/entities/gred_emp_base/init.lua:352