Even though this is an old post, I ran into the same issue and found the solution with help from Lacerte customer service that I'd thought I would share for others running into the same issue.

Most likely it is an input error on screen 18 for rental property (or royalty) income. I found that I erroneously entered the income in the field for "Credit for sick and family leave claimed on employment tax return" instead of "Rents or royalties received."