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Hi John - this error usually occurs when energy demands are exceedingly high - which in turn causes the Transformation calculations to get confused.
To try and debug this, I recommend first temporarily switching off Transformation calculations via the General: Settings: Scope screen (see screenshot).
Once you've done that, try calculating just your demand data and see how it looks. My guess is your energy demand results will be much too high. If so, check your units and scaling factors to see if you can spot what is going on.
Hope this helps!