As per remote check, we have fix the error "Unable to open a print file not designed for this computer".
We have asked the operator to print out a test PO, so now we need the image of the test PO.
We could check in our system if the printed PO has any problem.
If there is a problem then all the other POs printed will also have problems.
So it is important to provide the test PO image for our checking.