Please enter the license number and use any numbers and/or letters but do not enter any special characters such as - or * or spaces. The message is trying to stop the entry of any special characters or spaces and several states do have only numbers. Please be sure there are no extra spaces at the beginning or the end.
The driver's license number is an added security measure the IRS and States have put in place for 2017 but for most states, your return can be filed and will process without your driver's license number.
For more information, please see below.
Below is information on finding the New York document number.
These are the most likely solutions for buttons that don't work, fields that won't let you type or pages that will not Continue.