Not able to filter a dropdown list of text values

Hi! I´m trying to make a simple record filter of a dropdown list, which contains a list of text. To make the dropdown, I point to a constant which contains a text array with the name of the suppliers:

But the fact is that, when I try to make a simple filter, it doesn´t work. If I put a text value, nothing appears. If I try with an expression ("Proveedor 1") I have the following error:

I think it´s because of the list, because the filters work properly in individual text fields.

What can I do to fix it?

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