Error when batch printing

I receive a 500-internal server error when i try and batch print license plates.

We need this issue fixed by monday so that our production team can continue

Have you Edited it in custom docs?
If you have try loading the default one if you need a quick fix.
I noticed in friday that my packingslip also retuned 500.
It turned out that it had an unsupported dateformat in it.
I reverted to default and applied my wanted changes again.