How do I fix the error "Depr allowed or allowable is too large. For disposition calculations, depreciation cannot exceed business basis?"

Did you sell an asset or are listing a new one and trying to take section 179?

Go back to the entries and double check that your cost basis is accurate, then double check your entries.

If you are trying to take Section 179, if the asset is used for more than just business, you cannot claim a deduction for the portion that is personal.  For example, if you paid $30,000 for a new vehicle and you used it 50% for business, you cannot take depreciation of more than $15,000. 

depreciation you take on a depreciable asset cannot exceed its tax basis. depreciation includes section 179, special depreciation, and regular depreciation.  another limitation is that depreciation cannot not exceed the business portion of its tax basis. 

If the asset varied in business percentage from year to year, TurboTax can't calculate the sale.

You would need to say it was converted to personal use, then manually report the sale in the "Sale of Business Property" section, using your manually calculated amounts.  Or go to a good tax professional this year.