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@larryvzirilli  - Line 10 is line 1 minus line 2 and has nothing to do with line 9 which is in Part II (Business Use).  Line 9 is Part III (Personal use).

You are mis-reading the line 10 instructions that says: "Subtract line 2 from line1.  If *ZERO* stop here...unless...".  

Since line 10 is NOT zero, you do not stop there.   You complete the personal use section and get the credit.

There is no error to catch.
**Disclaimer: This post is for discussion purposes only and is NOT tax advice. The author takes no responsibility for the accuracy of any information in this post.**