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I also get this error on some occasions if I move from epub output to lrf output in the conversion window.
Traceback (most recent call last):
File "calibre\gui2\convert\single.pyo", line 152, in setup_pipeline
File "calibre\gui2\convert\single.pyo", line 134, in widget_factory
File "calibre\gui2\convert\lrf_output.pyo", line 39, in __init__
File "calibre\gui2\convert\__init__.pyo", line 52, in initialize_options
File "calibre\gui2\convert\__init__.pyo", line 73, in apply_recommendations
File "calibre\gui2\convert\__init__.pyo", line 123, in set_value
Exception: Can't set value u'' in opt_serif_family
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