Lerp, Vector3 and + won't work.

Questions & Answers
1

Here is a script on picking items up in C#, but it does not work because it says that
“Assets/PickUpAble.cs(26,97): error CS0019: Operator +' cannot be applied to operands of type UnityEngine.Vector3’ and float'", "Assets/PickUpAble.cs(26,48): error CS1502: The best overloaded method match for UnityEngine.Vector3.Lerp(UnityEngine.Vector3, UnityEngine.Vector3, float)’ has some invalid arguments” and “Assets/PickUpAble.cs(26,48): error CS1503: Argument #2' cannot convert object’ expression to type UnityEngine.Vector3'" and "Assets/PickUpAble.cs(53,17): error CS0103: The name carriedobject’ does not exist in the current context”
I got this script of a video.

using UnityEngine;
using System.Collections;

public class PickUpAble : MonoBehaviour {
public float distance;
public float smooth;
GameObject mainCamera;
bool carrying;
GameObject carriedObject;

void Start () {
	mainCamera = GameObject.FindWithTag("MainCamera");
}

// Update is called once per frame
void Update () {
	if(carrying) {
		carry(carriedObject);
	} else {
		pickup();
	}
}

void carry(GameObject o) {
	o.transform.position = Vector3.Lerp (o.transform.position, mainCamera.transform.forward + distance, Time.deltaTime + smooth);
}

void pickup () {
	if(Input.GetKeyDown (KeyCode.E)) {
		int x = Screen.width / 2;
		int y = Screen.height / 2;
		Ray ray = mainCamera.camera.ScreenPointToRay(new Vector3(x,y));
		RaycastHit hit;
		if(Physics.Raycast(ray, out hit)) {
			PickUpAble p = hit.collider.GetComponent<PickUpAble>();
			if (p != null) {
				carrying = true;
				carriedObject = p.gameObject;
				p.gameObject.rigidbody.isKinematic = true;
			}
		}
	}
}

void checkDrop() {
	if (Input.GetKeyDown (KeyCode.E)) {
		dropObject ();
	}
}

void dropObject() {
	carrying = false;
	carriedobject.gameObject.rigidbody.isKinematic = false;
	carriedObject = null;
}

}

2

That’s because variable named distance is a float value(a single number) and mainCamera.transform.forward is Vector3 variable(x,y,z(three numbers)),you cant add vector3 to float or float to vector3,you can try
this:

void Start () {
    mainCamera = GameObject.FindWithTag("MainCamera");
}
 
// Update is called once per frame
void Update () {
    if(carrying) {
        carry(carriedObject);
    } else {
        pickup();
    }
}
 
void carry(GameObject o) {
    o.transform.position = Vector3.Lerp (o.transform.position, mainCamera.transform.forward * distance, Time.deltaTime + smooth);
} //changed + to *
 
void pickup () {
    if(Input.GetKeyDown (KeyCode.E)) {
        int x = Screen.width / 2;
        int y = Screen.height / 2;
        Ray ray = mainCamera.camera.ScreenPointToRay(new Vector3(x,y));
        RaycastHit hit;
        if(Physics.Raycast(ray, out hit)) {
            PickUpAble p = hit.collider.GetComponent<PickUpAble>();
            if (p != null) {
                carrying = true;
                carriedObject = p.gameObject;
                p.gameObject.rigidbody.isKinematic = true;
            }
        }
    }
}
 
void checkDrop() {
    if (Input.GetKeyDown (KeyCode.E)) {
        dropObject ();
    }
}
 
void dropObject() {
    carrying = false;
    carriedobject.gameObject.rigidbody.isKinematic = false;
    carriedObject = null;
}

This needs to work now.