[metapost] Use metaflow.mp in lualatex using mplib?

[William Adams]

Metflow is a package which allows one to do flow charts in metapost:

http://www.utdallas.edu/~hamlen/metaflow.pdf
http://www.utdallas.edu/~hamlen/metaflow.mp
http://www.utdallas.edu/~hamlen/mftext.tex

When I try to use it, I get the error:

! Incomplete string token has been flushed.

How do I fix this?

William

-- 
William Adams
senior graphic designer
Fry Communications
Sphinx of black quartz, judge my vow.