Error when moving the ticket from any status to ready to test status

[dwike_aprilia]

Hi, so i have an issue here, 
Last time everything works fine until I make a copy of workflow and move the projects to that copy of workflow. Nothing is changed.

But I facing this issue :

and this is my scheme :

Is there anything that I missed?

As I remembered, I didn't change/touch the automation setting. Please help Thanks

[dwike_aprilia · Accepted solution]

Case closed. there was an additional validator inside the transition. I removed it then