position 30: invalid continuation byte. -- Note: Markdown only accepts unicode input!
Traceback (most recent call last):
  File "/Applications/calibre.app/Contents/Resources/Python/lib/python2.7/site.py", line 209, in main
    return run_entry_point()
  File "/Applications/calibre.app/Contents/Resources/Python/lib/python2.7/site.py", line 114, in run_entry_point
    return getattr(pmod, func)()
  File "site-packages/calibre/ebooks/conversion/cli.py", line 360, in main
  File "site-packages/calibre/ebooks/conversion/plumber.py", line 1198, in run
  File "site-packages/calibre/ebooks/conversion/plugins/pdf_output.py", line 145, in convert
  File "site-packages/calibre/ebooks/conversion/plugins/pdf_output.py", line 221, in convert_text
  File "site-packages/calibre/ebooks/conversion/plugins/pdf_output.py", line 172, in handle_embedded_fonts
  File "site-packages/calibre/ebooks/oeb/base.py", line 984, in fget
  File "site-packages/calibre/ebooks/oeb/base.py", line 918, in _parse_txt
  File "site-packages/calibre/ebooks/txt/processor.py", line 105, in convert_markdown
  File "site-packages/calibre/ebooks/markdown/__init__.py", line 280, in convert
UnicodeDecodeError: "utf8" codec can"t decode byte 0xe9 in position 30: invalid continuation byte. -- Note: Markdown only accepts unicode input!how to break
