Unity Noob: Unknown identifier error after building project on Android platform.

I'm building an Fps that I intend to put on multiple platforms, and I wanted to test it on android, but when I changed the build settings to android 2 Unknown Identifier errors popped up on the AI script. I'm curious why the script won't work in the android build like it did in the PC build, and what I have to do to get it working on that platform.

The first unknown identifier error is the CameraKick

 playerObj = Camera.main.transform.GetComponent(CameraKick).playerObj;
         attackRangeAmt = attackRange;
         initMove = Time.time;
         objectWithAnims.animation.CrossFade("idle", 0.3);
         // Auto setup player as target through tags
         if(target == null && GameObject.FindWithTag("Player") && targetPlayer){
             target = GameObject.FindWithTag("Player").transform;
         }

The second identifier error is the FPSRigidBodyWalker

 function CanSeeTarget () : boolean {
     var FPSWalker = playerObj.GetComponent(FPSRigidBodyWalker);
     if(FPSWalker.crouched){
         attackRangeAmt = attackRange * sneakRangeMod;//reduce NPC's attack range by sneakRangeMod amount when player is sneaking
     }else{
         attackRangeAmt = attackRange;
     }