Minimum energy path - DFT calculation

I am trying to run the DFT calculation using the tutorial materials, but I get the message that " the min energy path requires consistently ordered reactants and products". I have both the reactant and product in .xod file but don't know why I get this message. Also, if I try just EC reduction, the DFT calculation will fail. It doesn't generate any text file so I can see what is the issue either. 

Thank you!