something went worng we could not make a connection with the server

All screwed me when I added sale_price and changed the header.
I wrote in the previous header images at the moment the system displays it as a skip so I changed to the product image.
now I try to upload csv but I got error.
if I delete the link of the image and just write “image.jpg”
the csv upload successfully

the error:
https://app.box.com/s/lxnj0ujm7tkwwuqg1lac

header:
https://app.box.com/s/v0n9a85nzezl0iw45g0r