For the first problem - somewhere in your script you have a line like `define s = Person(...) ` or `default s = Person(...) `. `s` the variable name is used in the pronoun framework to make certain verbs plural. You can't have two variables named the same thing. Rename one or both.
For the second issue, you haven't provided enough information. I suggest if you're pretty new to all this that you just copy exactly what's written in the example labels and change one thing at a time and then test again to see if it does what you want.