Undefined local variable or method `city' for #<Context:0x10099d8>

first_name = gets.chomp
last_name = city

undefined local variable or method `city’ for #Context:0x10099d8

What does “undefined local variable or method `city’ for
#Context:0x10099d8” mean? Tried searching in Google, but no results
were returned …

It’s correct the message that return.
What is city?
Another variable or what?
You must define city first and next you can associate to other variable.