If you can be claimed as a dependent according to the rules, check the box in your personal information for "I can be claimed as a dependent by another taxpayer." You should be allowed to e-file. If you believe you don't meet the tests to be anyone else's dependent, you will need to print your return and mail it to the IRS. They will eventually investigate the duplicate dependent claim. Don't forget to also print and mail your state tax return if you have one.
