See if changing your responses Do not check the box for "I did not rent the property in 2017." Instead, enter zero for the number of days rented.
IF not it will be better to start the return over. You would have to reinput all the assets using last years form 4562 or underlying asset worksheets.
Do note that if it was available to rent, but just not rented you can still take losses... From IRS Pub 527: Vacant rental property. If you hold property for rental purposes, you may be able to deduct your ordinary and necessary expenses (including depreciation) for managing, conserving, or maintaining the property while the property is vacant. However, you cannot deduct any loss of rental income for the period the property is vacant. Vacant while listed for sale . If you sell property you held for rental purposes, you can deduct the ordinary and necessary expenses for managing, conserving, or maintaining the property until it is sold. If the property is not held out and available for rent while listed for sale, the expenses are not deductible rental expenses If the property was not listed for rent after the renters moved out, any costs for the period between that date and the date of the sale would be included in the basis of the property rather than rental expenses. Do not check the box for "I did not rent the property in 2017." Instead, enter zero for the number of days rented. Complete that portion of the interview, then enter the sale information under Assets/Depreciation.