title: Getting error 'The first argument should be either a string or an integer' in Laravel 5.2
body: <p>I'm trying to build simple login form using following code:</p>
  
  <pre><code>{!! Form::open(['class'=&gt;'login-form', 'method'=&gt;'post', 'action'=&gt;'AdminUserController@store']) !!}
      &lt;h3 class="form-title"&gt;Sign In&lt;/h3&gt;
      &lt;div class="alert alert-danger display-hide"&gt;
          &lt;button class="close" data-close="alert"&gt;&lt;/button&gt;
                      &lt;span&gt;
          Enter your email and password. &lt;/span&gt;
      &lt;/div&gt;
      &lt;div class="form-group"&gt;
          &lt;!--ie8, ie9 does not support html5 placeholder, so we just show field title for that--&gt;
          {!! Form::label('email', 'Email ID', array('class' =&gt; 'control-label visible-ie8 visible-ie9')) !!}
          {!! Form::text(['class'=&gt;'form-control form-control-solid placeholder-no-fix','type'=&gt;'email', 'autocomplete'=&gt;'off', 'placeholder'=&gt;'Email ID','name'=&gt;'email']) !!}
      &lt;/div&gt;
      .
      .
      .
      .
  {!! Form::close() !!}
  </code></pre>
  
  <p>and I'm getting following error:</p>
  
  <p><a href="https://i.stack.imgur.com/hDRI0.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/hDRI0.png" alt="enter image description here"></a></p>
  
  <p>Please help</p>