I have looked around to find an answer to my problem but have not come across any, so I'm sorry if I did overlook it. My script was working in the previous versions of Unity but ever since I did a recent update (I've been absent for a while) a lot of scripts have errors written all over them. Here is the script...

//class that defines the physical properties and attributes of the cannonball
class cannonBlast {
    var cannonball : GameObject;      //create a slot to assign the cannonball prefab to
    var blastParticle : ParticleEmitter;    //create a blast particle slot to assign a particle emitter
    var cannonLight : Light;          //create a light slot to assign a light prefab for when the blast occurs
    var spawnPos : Transform;          //create a slot to assign an empty game object as the point to spawn the cannon
    var shooting : boolean = false;        //a boolean we can use to stop the player from shooting during the actual shot
}

var cannon : cannonBlast;             //a varible used to access all other variables inside of the connected class (essentially a group)

//class that defines the mechanics of the cannonball
class cannonballMechanics {
    var fireRate : float = 0.5;          //a variable setting the rate of fire
    var reloadRate : float = 1.5;      //a variable setting the time for reload
    var force : int = 1000;           //the cannons maximum power

    @System.NonSerialized
    var nextFire : float = 0.0;          //a variable used to determine when to fire the next cannon
}

var mechanics : cannonballMechanics;       //a varible used to access all other variables inside of the connected class (essentially a group)

//inspector variables
//list of default variables that can be tweaked, selected, and changed inside the inspector
var instanceCannonball : GameObject;       //a variable holding an instance of the cannonball (which is duplicated upon firing)

function Start () {
}

function FixedUpdate () {
    Shoot();                    //function put inside FixedUpdate because it handles movement over time
}

//function to create and shoot the cannonball
function Shoot () {
    if (Input.GetMouseButton(0) && Time.time > mechanics.nextFire) {                                       //checks if the user clicks the left mouse button
        instanceCannonball = GameObject.Instantiate (cannon.cannonball, cannon.spawnPos.position, cannon.spawnPos.rotation);   //creates a duplicate of the cannonball
                                                                                   //at the applied position and rotation
        mechanics.nextFire = Time.time + mechanics.fireRate;
        instanceCannonball.rigidbody.AddForce (transform.forward * mechanics.force);                          //add - or + force to the duplicated cannonball
        Debug.Log ("Fire on Target!");
        cannon.shooting = true;                                                                //shows if the user is currently shooting
    } else {
        cannon.shooting = false;                                                            //shows if the user is not shooting
    }
}

The error is BCE0005: Unknown identifier: 'transform'. Located inside the shoot function, it's the line: instanceCannonball.rigidbody.AddForce (transform.forward * mechanics.force); I just don't see what's wrong with it. instanceCannonball was already declared and the variable used for adding force is declared in the class cannonballMechanics, referenced by mechanics...

Anyway, I had the same problem earlier with the error, BCE0005: Unknown identifier: 'Instantiate', located inside the shoot function, the line: instanceCannonball = GameObject.Instantiate (cannon.cannonball, cannon.spawnPos.position, cannon.spawnPos.rotation); Prior to the update I did not have to put (GameObject.) in front of Instantiate, but I checked a recent post stating the devs changed the coding. Java is more strict on defining variables. Problem is. I dont know how to edit the (transform. forward) to fix the error.

Any help or suggestions would greatly be appreciated. I'll still be attempting...