I've been having this problem while creating queries. Even if I copy the exact data from an already existing and working query I still sometimes get this error. Any idea what it is / how to fix it?
I've just checked again this morning and for some reason it now works fine as it is supposed to. I have no idea why or what happened but if I figure it out I'll update on this thread.
I also posted my query setup under here for those interested.

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Update after coming back to it for those interested.
We made a mistake in our formatting in our {{transformer2.value}}