Can not file my taxes by e-file. Says it needs a control number from my W-2. The number on the W-2 is 2. But when I enter that it says it is invaled for elctronic filing.

The Control Number in box d is not required to e-file a tax return.  Best to delete the W-2 and re-enter manually to clear this error.

You can e-file - that error is fixable!  You don't need a control number to enter your W-2.   If you get errors when attempting to e-file with an empty box D, just enter any number in this format: 5 digits, space, 5 digits (for example, 12345 67890).   The IRS doesn't care what's in box D.   

If you get errors when attempting to import your W-2 with an empty box D, select Type it in myself and manually enter your W-2.