State tax filing

My first suggestion is retrying the steps to get you to the solar credit carryover page and checking if there is a carryover listed for whatever year.  To do that please follow these steps:

1. Click on State Taxes and then Your State Returns
2. Click on "Edit" at the NY prompt then Continue
3. Click on "Update" at Credits and Other Taxes
4. Click "Continue" at the Child Care prompt, if any
5. Scroll down and Click on "Start" or "Update" under "Your Home" at the "Unused Solar Energy Credit Carryover"
6. Check for any entry and if there is one click on the entry and delete it.
7. Click continue
8. Continue on until you return to the main credit screen.
9. Click Done with Credits

If there was an entry in the carryover listing you should be fine after deleting it, go back to the screen on the left and follow these steps:

1. Click on Tax Tools, then Tools
2. Click on "Delete a Form", all the forms that are part of your return should show here
3. Scroll down to "Other Tax Credits and Taxes worksheet" and click delete.  If you do have other tax credits for NY, you will have to re-enter them after deletion.
4. Scroll to the bottom and click on "Continue with my return" and you should be good to go.

@CBTJr