[NTG-context] font switch in 'style' stopped working

Thank you, Hans. luatools --generate eliminated the error. But, font switch in 'style' stopped working. For example, \definehead[faculty][chapter] \setuphead [faculty][ incrementnumber=list, page=yes, number=no, align=middle, style=\bfb] produces bold but normal size font. \tfa also gives normal font. Help! Vyatcheslav