Problem solved. We selected each transition arrow in the FSM and started deleting them one at a time till we found which one was causing the error. Then we replaced it with another transition arrow with the exact same requirements and it works.
Thank you for your suggestion. I tried it out but unfortunately double-clicking on the error from the project check dialog box doesn't take me anywhere. I can see the error on the FSM channel but when I open it up, there are no errors inside.
Customer support service by UserEcho