In my experience, getting the standard tests working on your code is mainly about getting the test fixture right. As in the previous exercise, fixing the first error on our list isn't a coincident. It's a plain example of what you will be doing in getting the standard tests run on your code: bring the test fixture in the right state. In this specific case, we fixed the fresh fixture. Solving the remaining errors is again about updating the test fixture. In those cases, it concerns the shared fixture.
Looking closer at the remaining failing tests, it seems that our first error did not completely vanish. Saving you the trouble of going through all of them, I have picked out the following three failing tests:
Apparently, our generic fix for the CreateCustomer helper method did not have any effect on these. Debugging each of them shows eventually...