Problem in Uploading a tool

Dear Team,

I have tried to build my form in excel but upon deploying it is ring the error
Unexpected KoBoCAT error 400: b’{“detail”:“ODK Validate Errors:\n>> Something broke the parser. See above for a hint.\nError evaluating field ‘ageniced’ (${ageniced}[1]): The problem was located in Condition expression for ${ageniced}\nXPath evaluation: type mismatch \nThis field is repeated: \n\n${certi_year}[1]/actors[1];${certi_year}[2]/actors[1]\n\nYou may need to use the indexed-repeat() function to specify which value you want.\nCaused by: org.javarosa.xpath.XPathTypeMismatchException: The problem was located in Condition expression for ${ageniced}\nXPath evaluation: type mismatch \nThis field is repeated: \n\n${certi_year}[1]/actors[1];${certi_year}[2]/actors[1]\n\nYou may need to use the indexed-repeat() function to specify which value you want.\n\t… 11 more\n\nThe following files failed validation:\n${tmp280ysdwg}\n\nResult: Invalid”}’
I need help on what it is and how I can over come
Thanks

Welcome back to the community, @bakunzi! You could validate your XLSForm through this online validator to identify the issue.