Export error

Hi, I am fairly new to font design and maybe this is a stupid question but maybe somebody could help me see what did I do wrong. So when exporting I got an error message (Some glyphs are not compatible and will have no outlines).
When I exported before I had no problems. But now that set the autohinting parameters in the masters tab the only instance that is correctly exported is the bold version. The regular and italic version both have some missing glyphs. So obviously I did something wrong but I have trouble finding out what.
Can anbody help me?

Thank you.

Please read the tutorials about multiple masters, especially the one about keeping outlines compatible:
http://www.glyphsapp.com/tutorials/multiple-masters-part-2-keeping-your-outlines-comp atible