Image file upload rules in Request

Hi,

I have a form which takes input data as well as an image file.

I have created a request called "AccountRequest" and I put some validation filters for "file".

public function rules()
{
    return [
        'first_name' => 'required|min:3',
        'last_name' => 'required|min:3',
        'email' => 'required|email|max:255',
        'address' => 'required:min:5',
        'city' => 'required:min:3',
        'postal_code' => 'required:min:6',
        'file' => 'required|image|mimes:jpg,jpeg,png,gif|size:900'
    ];
}

if you look at the line: 'file' => 'required|image|mimes:jpg,jpeg,png,gif|size:900', I am filtering this file according to this criteria.

When I uploaded an image file and submit, I got the error message saying:

LogicException in MimeTypeGuesser.php line 127: Unable to guess the mime type as no guessers are available (Did you enable the php_fileinfo extension?)

Could you help me how to resolve this issue?

Thanks in advance