I can't run depreciation for my last period. How can I fix this?

When you perform the depreciation run for the last period, you cannot use the regular "Depreciation Run" function. There is a special function for running the Year-End. You can perform the Year End Run by going to Activities>Year-End Run. You will also find the Year-End Update function located there as well.

Once you perform the Year-End Update, you can now use the Depreciation Run function for your next period.