Starcompose gives uninformative error messages

[FelixAbrahamsson]

In this example there is an error in the function preprocess which is part of a composed function.

There are multiple problems here

1. The traceback doesn't tell us which module preprocess belongs to
2. The traceback doesn't tell us at which line of preprocess the error occurs

Any ideas on how to improve the tracebacks? Perhaps python have builtin decorators for this?

[samedii]

I have not looked into if there is a better solution but I added a function to help with this before. You can switch the function to starcompose.debug(...) and it will tell you where it is failing