When I try export it doesn’t finish and the message “Stems can’t be zero” appears. What am I doing wrong?
Sorry for bad English! 
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Check the stem settings in Font Info > Masters. You need to have a value in each.
Obrigada pelo retorno! Sorry for my bad English!!!
I managed to export, but spots appear instead of lines as I drew.
I am designing a single line font to use in the laser cut printer.
Single lines are not supported in OpenType fonts. Search the forum “Single line”.
Or for “open contour”, “open paths”, etc. and for “engraving”.