While POOH and rig down of tool string in Frac-8, the ledge of tools got engaged and stuck in coiled tubing tower that lead to weak point snapping. As a result, the tool string released from cable and dropped and reset over BOP frame and lower sheave wheel fall to the ground. Due to using single hook crane there should be a relative movement maintain between cable and PCE’s raisers to keep tool positioned and stationary, in case of winch shutdown and stop cable movement, overpull immediately applied to cable if crane keeps moving up.