Exception: Cannot use the "tables" module in the designer

[p.colbert]

It’s not documented, but see here:

Question about Custom Components in Beta Designer

Ah, that would do it! There’s a limited set of modules available inside the designer, but we’ll add anvil.tz to it However, here’s an as-yet-undocumented but useful feature: You can write: from anvil.designer import in_designer and now you have a boolean variable called in_designer, which you can use! So for example, you could replace your import anvil.tz with: from anvil.designer import in_designer if not in_designer: import anvil.tz Then you won’t get the ImportError in the d…

for a way to avoid executing that code in the designer.