How to find cause of server error 500 with code 222 in Zen Cart

Question

We have Zen Cart running on a Linux box and are trying to move it to another server. We get a server error 500 with the cryptic error message "number 222 from the VAT module".

What does this mean or how might we debug?

Answer 1

Error code 500 usually means that there is an issue in the app's logic. The VAT module would have to do with European taxes, I think. I would look in that section of code.