Kobo XLS Upload Error: Reading Passage

Hello,

I am attempting to develop an XLS form that includes a reading passage for a child learning assessment, to be uploaded to the save the children server. I have loaded the form to the ODK validation website and received this error:
Error: ODK Validate Errors:
[Fatal Error] :140:55630: The prefix “kb” for attribute “kb:flash” associated with an element type “select” is not bound.

XML is invalid.
org.xml.sax.SAXParseException; lineNumber: 140; columnNumber: 55630; The prefix “kb” for attribute “kb:flash” associated with an element type “select” is not bound.

The following files failed validation:
${BFA_literacy_template_XLS_27Sept24}.xml

Result: Invalid

Please provide guidance on how to address this error. The XLS form is attached.
BFA_literacy_template_XLS_27Sept24.xlsx (40.4 KB)

Thanks,
Julia

Welcome back to the community, @julia_taladay! Seems like you are trying to use the literacy widget. If yes, this post discussed previously should help you design the same as needed: