Did you possibly subscribe the tryk?
and also is it enabled on the server?
The error is client side.
When it says: Error Missing addon(s): bcombat.
That is what the server is running that the
client is not.
When it says: Error Missing server addon(s): tryk_uniforms.
That is what the client is running that the
server is not.
That being said some folder or startup parameter somewhere is running a tryk_uniforms.pbo. Unfortunately it could be anywhere in the arma 3 folder.