Unsupported construct [filter expression] when converting to xls

Hello members

My form just started showing the error ODK Validate errors:
org.javarosa.xpath.XPathUnsupportedException: XPath evaluation: unsupported construct [filter expression]

It was working fine till i made a few updates.
This is both on XLSForm Offline by nafundi and [http://opendatakit.org/xiframe/]

Kindly help

Hi @mauriceelagu
Could you attach your form?

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