The Non Resident Delaware State Return is available but there may be a form in your particular form that is preventing your return from being filed.
Here is an updated list of the availability of State Forms: State Forms Availability
If you are using a Desktop version of TurboTax, please be sure to Update. If you are unable to update automatically, here is a link to "force" an update: Manual Update for TurboTax Desktop
If you are using an Online version of TurboTax, please clear cookies on your browser and/or try a different browser. Here is a link with instructions to clear cookies: How to Clear Cookies
If you are unable to file after following the above suggestions I recommend that you file via Mail. The attached link has more details regarding printing and mailing return, at the bottom of the article: Rejected Returns & Printing & Mailing my Returns.
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