Hi!
After upgrading to 3.0.18 I still get this error. This began 4-5 versions ago.
TCPDF ERROR: [Image] Unable to get the size of the image: /images/stories/virtuemart/vendor/deejayzett copy.bmp
I get this error in administration-orders delivery note and invoice. And when I try to order something from shop.
Both on old and new orders. Tried .png, .jpg and .bmp files - same results.
Installed all 3 files, com_virtuemart.3.0.18.zip, com_virtuemart.3.0.18_ext_aio.zip and com_tcpdf_1.0.2.zip
Joomla 3.6.2
php 5.6.26
I removed {vm:vendorimage} from invoice letter headers, and then everything seems to work fine.
try a gif or jpg