A message just showed like this, see below:
Error: ODK Validate Errors:
Something broke the parser. See above for a hint.
Error evaluating field 'Building_alliances_Calcualtion' (${test}[1]/Building_alliances_Calcualtion[1]): The problem was located in Calculate expression for ${Building_alliances_Calcualtion}
XPath evaluation: cannot handle function 'IF'
Caused by: org.javarosa.xpath.XPathUnhandledException: The problem was located in Calculate expression for ${Building_alliances_Calcualtion}
XPath evaluation: cannot handle function 'IF'
... 10 more
The following files failed validation:
${test}.xml
Result: Invalid
What is that mean, when telling {XPath evaluation: cannot handle function 'IF'}, and how to solve this problem.