I'm getting an error with a corridor. I have 1 corridor defining 3 back of curb profiles for a parking lot. The part of the corridor for the curb circling the building is creating a hole (from surface elevation to 0). The alignment is 522' long, and the hole is between STA 5 and 520 (when the end meets the beginning). I've tried not running the assembly all the way to the end or beginning of the corridor, and that doesn't fix it. Any suggestions?