Error when calculating volumetric region

Hello, I have a model that I cannot compute the volumetric region for I get the error 

Warning : No regions computed.

Check for leaks and self-intersections in the mesh.

 

done

 

 

 

region-name number of baffles zone ids of baffles

 

-------------------- -------------------- --------------------

 

external baffles 14 (21 20 19 18 17 16 15 14 13 12 11 10 9 8)

I have run all available diagnostics commands but still cannot compute the volumetric region.

 

/diagnostics quality general-improve objects (en*) skewness 0.95 40 30 yes
/diagnostics quality general-improve objects (en*) skewness 0.9 40 30 yes
/diagnostics quality general-improve objects (en*) skewness 0.8 40 30 yes
/diagnostics quality general-improve objects (en*) skewness 0.7 40 30 yes
/diagnostics quality general-improve objects (en*) skewness 0.6 40 30 yes
/diagnostics quality general-improve objects (en*) skewness 0.5 40 30 yes

/diagnostics quality collapse objects (en*) skewness 0.99 40 30 no
/diagnostics quality collapse objects (en*) skewness 0.98 40 30 no
/diagnostics quality collapse objects (en*) skewness 0.97 40 30 no
/diagnostics quality collapse objects (en*) skewness 0.96 40 30 no
/diagnostics quality collapse objects (en*) skewness 0.95 40 30 no
/diagnostics quality collapse objects (en*) skewness 0.9 40 30 no
/diagnostics quality collapse objects (en*) skewness 0.85 40 30 no

/diagnostics quality general-improve objects (en*) skewness 0.95 40 30 yes
/diagnostics quality general-improve objects (en*) skewness 0.9 40 30 yes
/diagnostics quality general-improve objects (en*) skewness 0.8 40 30 yes
/diagnostics quality general-improve objects (en*) skewness 0.7 40 30 yes
/diagnostics quality general-improve objects (en*) skewness 0.6 40 30 yes
/diagnostics quality general-improve objects (en*) skewness 0.5 40 30 yes

/diagnostics quality general-improve objects (en*) skewness 0.95 40 30 yes
/diagnostics quality general-improve objects (en*) skewness 0.9 40 30 yes
/diagnostics quality general-improve objects (en*) skewness 0.8 40 30 yes
/diagnostics quality general-improve objects (en*) skewness 0.7 40 30 yes
/diagnostics quality general-improve objects (en*) skewness 0.6 40 30 yes
/diagnostics quality general-improve objects (en*) skewness 0.5 40 30 yes

/diagnostics face-connectivity fix-free-faces face-zones (list 'front 'middle 'rear 'wheel-fr 'wheel-rr) stitch 0.05 1
/diagnostics face-connectivity fix-self-intersections face-zones (list 'front 'middle 'rear 'wheel-fr 'wheel-rr) fix-self-intersection
/diagnostics face-connectivity fix-duplicate-faces face-zones (list 'front 'middle 'rear 'wheel-fr 'wheel-rr)
/diagnostics face-connectivity fix-spikes face-zones (list 'front 'middle 'rear 'wheel-fr 'wheel-rr) 200
/diagnostics face-connectivity fix-islands face-zones (list 'front 'middle 'rear 'wheel-fr 'wheel-rr) 12
/diagnostics face-connectivity fix-slivers face-zones (list 'front 'middle 'rear 'wheel-fr 'wheel-rr) 0 0.7
/diagnostics face-connectivity fix-point-contacts face-zones (list 'front 'middle 'rear 'wheel-fr 'wheel-rr)
/diagnostics face-connectivity fix-invalid-normals face-zones (list 'front 'middle 'rear 'wheel-fr 'wheel-rr)
/diagnostics face-connectivity fix-multi-faces face-zones (list 'front 'middle 'rear 'wheel-fr 'wheel-rr) all-above 5 20 20

I believe it may have something to do with leaking geometry but I cant seem to find anything that's causing the problem, has anyone come across this before? Any help would be much appreciated