More Precise Log Output in Architect

I am using a custom user extension in SA 3.1. When I add it to a grid, Architect will no longer render the grid in Architect.

It gives me an error message in the log saying: "Design View", "Framework Error: Cannot call method 'apply' of undefined", "Name: myproject Framework: ext42".

When I run my app in a browser, I do not get any errors and everything renders correctly.

What is the easiest way to find the piece of code causing the error?

More Precise Log Output in Architect