I am using weberp 4.12.2.
When I am trying to print purchase order then I always get the error message:
TCPDF ERROR: [Image] Unable to get the size of the image
On the other way I can print BOM without problems.
Do you have an company logo/image loaded in your "companies/<companyname>" directory? It should be named logo.jpg. The error probably means it can not load the image to resize it. The other report works because there is no image on that report.