Extending OOTB Express ECO Workflow

Hi All,

I am Trying to Extend Express ECO Workflow last activity of this Wf is Close Change but now in my case I am renaming this close change activity label name to Implementation Changes and untick the End Activity & Automatic Activity. and adding two new activities as Implement and Non-Implement with ticked End Activity & Automatic Activity as below 

Now when I do Voting I am getting below Error. 

 

can anyone help me to Resolve this.

Thanks in Advance.