construction conflicts between surfaces '1', and '1'

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Dear all,

This warning pops up at the end of a simulation:

[openstudio.model.ConstructionBase] <1> Could not resolve matched surface construction conflicts between surfaces '1', and '1', area calculation may be incorrect

I am not sure what it means as there are no surfaces "1" in the model.

I am using the default settings in OpenStudio for ASHARE 90.1-2010 Office in Climate zone 3 and have the ideal load set to ON.

It doesn't seem to be having an effect on the result of the simulation but it would like to confirm that this is really the case and it would be even better if it can be resolved.

Thanks in advance, Daniel