[Koha] Error regarding Bulk upload of patron images.

[rocky bang]

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.