I compiled a volume shader using the shader command. I then tried to bring that shader into Maya 2008 and it gave me the above error. I've tried several different shaders and they all give the same error. Perhaps there is a problem with the correct version of the shader command that is compiling the shaders.
Incidentally, I tried recreating the problem in Maya 2009, but Renderman for Maya won't even load. I've attached that error message as well.
Maya 2008:
// Error: (01/17 13:12) rman Error: Problem reading shader /project/VSFX/sub/light_shaders/fog.slo: (exec "/opt/pixar/RenderMan_Studio/plug-ins/../bin/toslim" "/project/VSFX/sub/light_shaders/fog.slo") //
// Error: (01/17 13:12) rman Error: Can't find shader definition /project/VSFX/sub/light_shaders/fog.slo for RenderManVolume1 //
// Error: (01/17 13:12) rman Error: Problem reading shader /project/VSFX/sub/light_shaders/fog.slo: (exec "/opt/pixar/RenderMan_Studio/plug-ins/../bin/toslim" "/project/VSFX/sub/light_shaders/fog.slo") //
// Warning: rman Warning: This shader node appears to be from an older version of RenderMan for Maya. Reloading is recommended for the node to display correctly in the Attribute Editor. //
Maya 2009:
// Error: Unable to dynamically load : /opt/pixar/RenderMan_Studio/plug-ins/RenderMan_for_Maya.so
/opt/pixar/RenderMan_Studio/plug-ins/RenderMan_for_Maya.so: undefined symbol: _ZN7MGlobal17getAssociatedSetsER14MSelectionListR12MObjectArray //
// Error: /opt/pixar/RenderMan_Studio/plug-ins/RenderMan_for_Maya.so: undefined symbol: _ZN7MGlobal17getAssociatedSetsER14MSelectionListR12MObjectArray //
// Error: /opt/pixar/RenderMan_Studio/plug-ins/RenderMan_for_Maya.so: undefined symbol: _ZN7MGlobal17getAssociatedSetsER14MSelectionListR12MObjectArray (RenderMan_for_Maya) //