@rafaelsnv
I think the problem is the same like here: Error in ODK Collect: Attempt to invoke virtual method 'java.lang.String.org.javarosa.core.model.SelectChoice.getTextID()' on a null object reference
but I can't be a 100% sure because the form you shared with me does not contain some choices and i can't convert it.
Please share the correct version with mes so that I can confirm if it's the same bug.