What should I do with the invalid blank Outside Boundary Condition Object?

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Can someone help me with the following:

** Severe  ** FenestrationSurface:Detailed="FACE 10", invalid blank Outside Boundary Condition Object
**   ~~~   ** ...when Base surface uses "Surface" as Outside Boundary Condition Object, subsurfaces must also specify specific surfaces in the adjacent zone.
** Severe  ** FenestrationSurface:Detailed="FACE 25", invalid blank Outside Boundary Condition Object
**   ~~~   ** ...when Base surface uses "Surface" as Outside Boundary Condition Object, subsurfaces must also specify specific surfaces in the adjacent zone.
**  Fatal  ** GetSurfaceData: Errors discovered, program terminates.

Thanks