On my server i have installed WAC Aircraft

All the planes work just fine and so did the Helicopters... For a while...

Now when i get in a WAC Helicopter it starts up but when i try to lift off of the ground it just stays still. All of the players on my server have complained to me about this and no its not the Flight controls.

I have uninstalled and re installed a fresh version of the addon and the problem still exists.

Also everytime i spawn a Helicopter this message floods server side console:

[ERROR] addons/wac aircraft/lua/entities/wac_hc_base/init.lua:819: bad argument
#2 to '__mul' (number expected, got nil)
1. __mul - [C]:-1
2. unknown - addons/wac aircraft/lua/entities/wac_hc_base/init.lua:819:

Thanks for helping!