Laravel - Exception message: Undefined variable

I am new to laravel. Recently I cloned sample project from github. When I migrate the code. I got Exception message: Undefined variable: allowAddLeadInvestorExecutive

Controller:

public function index()
{
  $customViewData     =   [
      'allowAddleadInvestorExecutive'      =>  1,
  ];
  $viewData           =   array_merge($this->layoutData, $customViewData);
  return view('controller.index', $viewData);
 }

View: index.blade.php

extends($layout)
@section('content')

@if ($allowAddLeadInvestorExecutive == 1)
<!-- Html code -->

@

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