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When you tell DView to view outputs in IP units instead of SI units, it uses an internal list of unit conversions to convert the outputs. There is no "lum/W" unit conversion, so it gives that error. The only way to avoid the error would be to view the outputs in SI units.

What would the IP units equivalent of lum/W -- lum/(Btu/hr)? It's pretty trivial for someone to update DView to include a new unit conversion, though the OpenStudio team would have to package up a new version of DView with this change.