this is the last line in terminal (that process doesn't exceed that after about 10 hours!!!)

"CORRECTING DEFECT 0 (vertices=21958, convex hull=6147, v0=0)"

but the first time i run this data set, there was more another line in terminal:

"XL defect detected ..."

now i want to know why this error occurred ? and what should i note in my data to never encounter this error again?

(I read some similar mails, but i didn't understand my questions)

thanks a lot again for your attention