php - Laravel 5.1 : htmlentities() expects parameter 1 to be string, array given

I'm encountering an error "htmlentities() expects parameter 1 to be string, array given", when I debug my code, this line from controller throwing the error.

return redirect()->back()->withErrors($validator)->withInput();
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Controller

  $rules = array(
            'email' => 'required|email|unique:inspector_details', // required and must be unique in the ducks table
        );

        $validator = Validator::make(Input::all(), $rules);
        if ($validator->fails()) {
            $messages = $validator->messages();
           return redirect()->back()->withErrors($validator)->withInput();
        }
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VIEW

    {!! Form::open(array('route' => 'inspector.store','class' => 'form','id' => 'createinspector','name' => 'createinspector','files' => true)) !!}
    <input type="hidden" name="_token" value="{{ csrf_token() }}">
    <input type="hidden" name="uid" id="uid" value="" />
    <div >
      <div >
        <label>Name<span >&nbsp;*</span></label>
        <input type="text" name="firstname" id="firstname" value="{{ Input::old('firstname') }}" placeholder="Enter Name" required="required">
      </div>
      <div >
        <label>Email<span >&nbsp;*</span></label>
        <div >
          <span ><i ></i></span>
          <input type="email" name="email" id="email" placeholder="Email" value="{{ Input::old('email') }}" required="required">
        </div>
        <input type="checkbox" name="emailprivate" value="{{ Input::old('emailprivate') }}" id="emailprivate" >&nbsp;&nbsp;<span >Keep email private.</span>
      </div>
      <div >
        <label>Zip Code<span id="zipvalidation" >&emsp;Enter either 5 or 9 digits.</span></label>
        <input type="text" name="zip" id="zip" onkeydown="validateNumber(event);" maxlength="9" value="{{ Input::old('zip') }}" placeholder="Enter Zip Code">
      </div>
      <div >
        <label>Company<span >&nbsp;*</span></label>
        <input type="text" name="company" id="company" value="{{ Input::old('company') }}" placeholder="Enter Company Name">
      </div>
      <div >
        <label>Website</label>
        <input type="url" name="website" id="website" value="{{ Input::old('website') }}" placeholder="Enter Website url e.g http://www.google.com">
      </div>
      <div >
        <label>Phone Number</label>
        <div >
          <div >
            <i ></i>
          </div>
          <input type="text" name="phone" id="phone" onkeydown="validateNumber(event);" value="{{ Input::old('phone') }}" placeholder="Enter Phone number">
        </div>
      </div>
      <div >
        <label>Free text</label>
        <textarea rows="2" name="freetext" id="freetext" value="{{ Input::old('freetext') }}" placeholder="Enter Text"></textarea>
      </div>
      <div >
        <label for="exampleInputFile">Select logo</label>
        {!! Form::file('logoimage', null) !!}
        <p ></p>
      </div>
      <!-- /.form-group -->
    </div>
    <!-- /.col -->
    <div >
      <div >
        <label>Inspection Type</label>
        <select name="inspectiontype[]" id="inspectiontype" value="{{ Input::old('inspectiontype') }}" multiple="multiple" data-placeholder="Select Inspection Type" >
          <option value="home" selected          <option value="roof">roof</option>
          <option value="asbestos">asbestos</option>
          <option value="lead">lead</option>
          <option value="HVAC">HVAC</option>
          <option value="pest">pest</option>
          <option value="septic">septic</option>
          <option value="environmental">environmental</option>
          <option value="plumbing">plumbing</option>
          <option value="zoning">zoning</option>
          <option value="mold">mold</option>
          <option value="wood destroyin g organisms (WDO)">wood destroying organisms (WDO)</option>
        </select>
      </div>
      <div >
        <label>Company Begin Date:</label>
        <div >
          <div >
            <i ></i>
          </div>
          <input type="text" name="companybegindate" id="companybegindate" value="{{ Input::old('companybegindate') }}" id="datepicker">
        </div>
        <!-- /.input group -->
      </div>
      <div >
        <label>street address 1<span >&nbsp;*</span></label>
        <input type="text" name="residaddress1" id="residaddress1" value="{{ Input::old('residaddress1') }}" placeholder="Enter Street Address 1">
      </div>
      <div >
        <label>street address 2<span >&nbsp;*</span></label>
        <input type="text" name="residaddress2" id="residaddress2" value="{{ Input::old('residaddress2') }}" placeholder="Enter Street Address 2">
      </div>
      <div >
        <label>City</label>
        <input type="text" name="city" id="city" value="{{ Input::old('city') }}" placeholder="Enter City">
      </div>
      <div >
        <label>State<span id="statevalidation" >&emsp;Enter two characters only e.g NJ</span></label>
        <input type="text"  name="state" id="state" value="{{ Input::old('state') }}" placeholder="Enter State e.g NJ">
      </div>
      <div >
        <label>Licensing:</label>
        <input type="text" name="licname" id="licname" value="{{ Input::old('licname') }}" placeholder="Enter Licensing name">
        <input type="text" name="licid" id="licid" value="{{ Input::old('licid') }}" placeholder="Enter Licensing ID">
        <input type="text" name="licurl" id="licurl" value="{{ Input::old('licurl') }}" placeholder="Enter URL to governing body">
      </div>
      <!-- /.form-group -->
    </div>
    <div >
      <div >
        <button type="submit" onclick="return validate_data()">Create Inspector</button>
      </div>
    </div>
    {!! Form::close() !!}
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Any help is much appreciated..