Hello,
Please, I am also facing similar challenge with my project in Kobo tool box form builder. I tried to deploy my project form but the following error pop out. Please, I need help with it as soon as possible because I am very behind schedule, and I am suppose to meet with my supervisor on Thursday, 22nd January, 2026, to show him the progress of my fieldwork:
Error occured during the loading of this form. We do not recommend you use this form for data entry until this is resolved.
Please contact support@kobotoolbox.org with the link to this page and the error message below:
FormLogicError: Could not evaluate: instance(‘Any_adopted_strategy?’)/root/item, message: Failed to execute ‘evaluate’ on ‘XPathEvaluator’: The string ‘instance(‘Any_adopted_strategy?’)’ is not a valid XPath expression.
Hello,
Please, I am also facing similar challenge with my project in Kobo tool box form builder. I tried to deploy my project form but the following error pop out. Please, I need help with it as soon as possible because I am very behind schedule, and I am suppose to meet with my supervisor on Thursday, 22nd January, 2026, to show him the progress of my fieldwork:
Error occured during the loading of this form. We do not recommend you use this form for data entry until this is resolved.
Please contact support@kobotoolbox.org with the link to this page and the error message below:
FormLogicError: Could not evaluate: instance(‘Any_adopted_strategy?’)/root/item, message: Failed to execute ‘evaluate’ on ‘XPathEvaluator’: The string ‘instance(‘Any_adopted_strategy?’)’ is not a valid XPath expression.
Welcome to the community, @adjeo! The error seems to be caused by an invalid instance() expression. The instance name contains characters that make the XPath string invalid. You may need to validate your XLSForm through this online validator to find the exact source of the error.
Maybe you should be able to learn more about the instance function as outlined in the hyperlinked site.
