depth map stop working at axial line analysis when reduce to fewest map line

hi
i am using depth 1015 , i have problem when i automatically analysis to axial line by using depth map it reaches 70% and stop working .. cannot reduce lines to segments ..
using windows 7
cor i 7
ram 16 GB
PROCESSOR 2.4Ghz
plz need help @SpaceGroupUCL @varoudis 
