"no suitable method found for add()" error

I'm getting that error in the title and I've never encountered it before can someone enlighten me on how to fix it

Here's my first class: http://pastebin.com/rCaQa4Yd

Here's my test class where the error resides: http://pastebin.com/t5L6Ummm

The error is in line 31

If you want to store a Customer object in the arraylist, you need to declare the array as such.

Rather than

Code:

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ArrayList<String> customerList;

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try

Code:

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ArrayList<Customer> customerList;

---