Title Validation based on ID Number

Summary:

Hi All,

Wrote a rule which looks at the last digit of the National ID number and validates if Title entered is Mr, Ms, Mrs, or Miss. But I am getting below error:

I chose to write the rule in Person Legislative Object because there are some limitations in Person Objects and Person Legislative Object triggers before Person Names, Person National Identifier or any other Person objects (So I read on Autocomplete documentation). Though I tried Nation Identifier object but same error.

Here is the rule, please let me know if you can help. Thank you so much.