The operation make a pair cannot accept the arguments: ,[*nothing*],[*nothing*]

Hello,
I have been making changes in the application that I have for some time and when I test it, just start it returns this error:

The operation make a pair cannot accept the arguments: ,[*nothing*],[*nothing*]

The doubt I have that I do not know very well what can be failing when it says "make a pair".
Does anyone know what it could be?
Thanks in advance

Look for the place where you are adding items to a dictionary.

If you don't see any, post your exported .aia file here and tell us which Screen this happens in.

In addition to @ABG's comment, you can use the up/down arrows in the bottom left corner of the blocks editor to jump between warnings/errors in your project. The empty sockets (resulting in *nothing* should appear as warnings).

Thanks for the answers!!!
yes, it was dictionary that I had put entries without values....