Constant expression contains invalid operations

gistfile1.txt

protected $rules = array(
		'brand'=>'required',
		'model'=>'required',
		'source'=>'required',
		'name'=>'required|string|min:3|max:255',
		'email'=>['nullable','email','max:255',new EmailValidator()],// this line is causing error
		'phone'=>'required|digits_between:10,15',
		'alt_phone'=>'nullable|digits_between:10,15',
		'address'=>'required|string|min:3',
		'description'=>'required|string|min:3',
		'state'=>'required',
		'city'=>'required',
		'follow_date'=>'required|date|after:today',
		'visit_date'=>'required|date|after:today',
	);
  
  
  //Validation
  	public function store(Request $request){

		$lead = new Lead;

		if ($lead->validate($request->all())) {

			$request->request->add([
				'created_by' => Auth::user()->id,
				'follow_date' =>date('Y-m-d', strtotime($request->follow_date)),
				'visit_date' =>date('Y-m-d', strtotime($request->visit_date)),
				'state'=>state::where('id',$request->state)->first()->name
			]);
			Lead::create($request->except('_token'));

		} else {

			return back()->withErrors($lead->errors())->withInput($request->all());

		}

	}