Argument Missing in Expression Builder

This was entirely built by the Expression Builder. I didn't type anything, not one letter or character! ConcatenateText("(",GRxInsTel_Business1.area_code,") ", ExtractSubstring(GRxInsTel_Business1.phone_no, 0, 3),"-", ExtractSubstring(GRxInsTel_Business1.phone_no, 3, 4))

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