[Koha] Error regarding Bulk upload of patron images.

I want to upload patron images in bulk. Koha version = 3.08.01 I am using following steps of uploading bulk patron images using .zip file having cardnumber followed by imagename.jpeg (140*166 size) in .txt file and images along with it. Getting the following error: Patron image failed to upload - Unpacking completed - 1 directories scanned. - 1 directories processed. - - Cardnumber: *WARNING:* This image *not* imported because the cardnumber and filename is missing. thanks in advance.