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The asssignment says:
The int token arg is to be passed to the addToken() method.

I don't understand the problem with the id variable(s).
The statement that starts with:
String id
defines a...

Is that what the assignment says to do?

That says to pass an int value as an arg

About the variable: id
You can use it more than one time
or you can define a new variable (like id2) and use...

If there are two variables with the same name, change the name of one of them:

String id = something; // define variable: id and assign it a value
...
String id2 = somethingelse; //define new...

There can only be one variable with each name. The compiler sees two variables with the name: id.
Either change the name of one of them, for example: id2
or reuse the first variable and do not...