I have the same problem, but I can not find the line that E + warns, even opening the file in SU. Everything looks ok. Anyone with the same problem?

The warning:
** Warning ** CalculateZoneVolume: The Zone="94" is not fully enclosed. To be fully enclosed, each edge of a surface must also be an edge on one other surface.
** ~~~ ** The zone volume was calculated using the floor area times ceiling height method where the floor and ceiling are the same except for the z-coordinates.
** ~~~ ** The surface "94_CEILING_1_0_0" has an edge that is either not an edge on another surface or is an edge on three or more surfaces:
** ~~~ ** Vertex start { 0.2121, -0.4419, 3.3000}
** ~~~ ** Vertex end { -1.3081, 1.0783, 3.3000}
** ~~~ ** The surface "94_CEILING_1_2_1" has an edge that is either not an edge on another surface or is an edge on three or more surfaces:
** ~~~ ** Vertex start { 2.1567, -2.3865, 3.3000}
** ~~~ ** Vertex end { 0.2121, -0.4419, 3.3000}

The surface IDF:

BuildingSurface:Detailed,
94_Ceiling_1_0_0, !- Name
Ceiling, !- Surface Type
3, !- Construction Name
94, !- Zone Name
Surface, !- Outside Boundary Condition
228_Floor_0_0_10061, !- Outside Boundary Condition Object
NoSun, !- Sun Exposure
NoWind, !- Wind Exposure
0, !- View Factor to Ground
, !- Number of Vertices
2.6625, !- Vertex 1 X-coordinate {m}
-1.6875, !- Vertex 1 Y-coordinate {m}
3.3, !- Vertex 1 Z-coordinate {m}
2.6625, !- Vertex 2 X-coordinate {m}
0.4625, !- Vertex 2 Y-coordinate {m}
3.3, !- Vertex 2 Z-coordinate {m}
0.1625, !- Vertex 3 X-coordinate {m}
0.4625, !- Vertex 3 Y-coordinate {m}
3.3, !- Vertex 3 Z-coordinate {m}
0.1625, !- Vertex 4 X-coordinate {m}
-1.6875, !- Vertex 4 Y-coordinate {m}
3.3; !- Vertex 4 Z-coordinate {m}

BuildingSurface:Detailed,
94_Ceiling_1_2_1, !- Name
Ceiling, !- Surface Type
3, !- Construction Name
94, !- Zone Name
Surface, !- Outside Boundary Condition
265_Floor_0_0_10042, !- Outside Boundary Condition Object
NoSun, !- Sun Exposure
NoWind, !- Wind Exposure
0, !- View Factor to Ground
, !- Number of Vertices
0.3375, !- Vertex 1 X-coordinate {m}
0.4625, !- Vertex 1 Y-coordinate {m}
3.3, !- Vertex 1 Z-coordinate {m}
0.3375, !- Vertex 2 X-coordinate {m}
3.2125, !- Vertex 2 Y-coordinate {m}
3.3, !- Vertex 2 Z-coordinate {m}
0.1625, !- Vertex 3 X-coordinate {m}
3.2125, !- Vertex 3 Y-coordinate {m}
3.3, !- Vertex 3 Z-coordinate {m}
0.1625, !- Vertex 4 X-coordinate {m}
0.4625, !- Vertex 4 Y-coordinate {m}
3.3; !- Vertex 4 Z-coordinate {m}

@baum, can you give some history of the file. What version of OpenStudio are you using, did you create geometry from scratch in OpenStudio or was there a source gbXML or DXF file that was imported?

I am using 2.3.0 currently. The geometry was created using sketchup with the openstudio plugin.

@David Goldwasser if it helps I can send link to my model before and after I corrected it.

@Avi, that would be great.

@David Goldwasser I sent it. Did you get it?