Business & farm

When I do the "Your completecheck™ to-do list" and then click Review, it says:

 

"IRS Rules Don't Allow E-filing for Your Federal Return
"Why? Well, it looks like you have a tax situation in your federal return that makes it ineligible for e-filing.
"Here are the details:
"You have negative cost or other basis on Form 8949, Sales and Other Dispositions of Capital Assets."

 

I do not know where I have a negative basis on any of my sales.