Boundary error in Floworks

[phonix]

When I click on a surface for an internal calculation, and set up a gas pressure -- I get an error that says 'error: face is not lying on a boundary between solid and fluid region.'

I seem to have a closed system with lids, so I am very confused. Any idea what could be wrong? This is all within the computational domain.

 

[phonix]

I found it. There was a leak in the system.