What may be the possible causes that my cast is failing

I am trying to make a vehicle selection system in ue4 with blueprints. I have followed this video.

Below are the screenshots of my code. screenshot1 and screenshot2

firstly I tried to figure out what is happening to my code then I came to know that the cast was not succedding and hence the car is being spawned but not posessed.

please help me by listing some reasons that may be responsible for this. if you want any info so I have given the link of the video which I have used to make the system.

thanks in advance.

Solution

I found the answer

I just searched it on Google and found it here: https://answers.unrealengine.com/questions/98622/view.html