Call to 'gnu.expr.Closure' has too few arguments

Can anyone tell me what this means?

Sorry, I cannot display code due to privacy regs.

Tanks

Sure, if you provide some code.

Sorry, all we can help with in that situation is the haystack of general advice https://community.appinventor.mit.edu/search?q=runtime%20error

Somewhere, you are attempting to populate a variable or list item etc. that does not have a value yet.

Check if you are running the latest Companion.

Do you have a Procedure that is expecting to receive a value (argument) for processing, but a button click or other event is calling the Procedure without sending a value? Or, a Procedure that used to require a value that has since been modified to exclude it?

We shouldn't see this error in the latest versions of AI2 but it was an issue before:
https://groups.google.com/forum/#!topic/mitappinventortest/2pBa91dz8Sw

It might also be related to switching screens incorrectly:
https://groups.google.com/g/mitappinventortest/c/6pYhb6VoUfI?pli=1

... and also might be a bug in an Extension - could simply be an extension version that is not compatible with the latest AI2 or latest Android.

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