I have locators (with aim) in my scene. I have attached my locators to a curve (attach to motion path ) When I move the locators, I get this:

// Warning: file: C:/Program Files/Autodesk/Maya2013/scripts/startup/setNamedPanelLayout.mel line 151: Cycle on 'addDoubleLinear187.output' may not evaluate as expected. (Use 'cycleCheck -e off' to disable this warning.) //

What exactly is cycle check and why is this an error?

If someone could explain this, I would greatly appreciate it.