Laravel 5 uploading zip file showing Undefined variable: e

I've created a file upload method and the file uploading with the file extension like jpg, png etc are successful. However, when I upload a zip file, it says me "Undefined variable: e". To find, I did dd() at the beginning of the respective method but it still says the above error. My route is as below:

Route::post('media/savedata/{id?}/{page?}', 'Administrator\MedialibraryController@savedata'); 

The method is as below:

public function savedata($id, $page, Request $request) {
 ...
}

The content of the "network" tab is as below:

Request URL: http://localhost/stmd/administrator/media/savedata/0/1
Request Method: POST
Status Code: 500 Internal Server Error
Remote Address: [::1]:80
Referrer Policy: no-referrer-when-downgrade

------WebKitFormBoundaryaHtERzAAThbQB4ae
Content-Disposition: form-data; name="_token"

TXLvBGRXrdjpQbhAjm18MTxkiHamauvcjhKBhl6n
------WebKitFormBoundaryaHtERzAAThbQB4ae
Content-Disposition: form-data; name="fileType"

I
------WebKitFormBoundaryaHtERzAAThbQB4ae
Content-Disposition: form-data; name="fileName"; filename="gradle-3.5-bin.zip"
Content-Type: application/zip

My intention is: If zip file is upload then it will redirect to another page however, I can't do this because even dd() is not working.

via Chebli Mohamed