Hi!
Your shortcode placement seems all rigth to me, it should work.
Is the error message related to the search plugin? Can you please paste it here, I might be able to tell if it’s something known.
The fact that your theme does not support widgets in header should not affect the search, but I might be wrong.
Also, what happens if you place the search somewhere else? (inside a page, post or widget bar) Is it working then?
Best,Ernest Marcinko
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