Robot IK Path (Target 0) Program - Not reachable

Hello. Realvirtual team.

I created a Robot IK Path (Target 0) while learning Robot IK following the realvirtual professional tutorial, 

but I have a question because IK cannot reach the Target 0.

I used the "ABB IRB4400" Robot model and performed the following tasks.

1) Robot 6-axis configuration and Drive settings

2) Robot TCP configuration

3) Add Robot IK component and then 6-axis and TCP settings

4) Path creation and then IK Path component

→ When I tried Add new Target, it said it cannot be reached. (It is clearly an area that can be reached.)
→ I also tried moving the Target here and there, but the robot does not follow at all.

Can you guide me on where I made a mistake and caused this situation?

Thanks.

Best regards,

Seokhyun Lee

※ Problem Situation (Capture)

※ Robot Setting (Capture)