Error message in when previewing form

Please this is the message i get when i try to preview my questionnaire.
FormLogicError: Could not evaluate: ${received_extension} = ‘yes’, message: Failed to execute ‘evaluate’ on ‘XPathEvaluator’: The string ‘${received_extension}’ is not a valid XPath expression.
can anyone help me?

Hi @ikmumuni and welcome to the community!

It seems like one of your relevant strings doesn’t match with the name of your question. Can you check if the name of your related question is received_extension precisely?

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@ikmumuni, try validating your XLSForm through the online validator. The online validator should help you identify syntax issues if any present within your XLSForm.