[NTG-context] Typescript not found

I have some typescript problems. The output says fonts > typescripts > unknown: library 'mytypescript' fonts > typescripts > unknown: library 'Myface' fonts > preloading latin modern fonts (third stage) In my environment file I have \usetypescriptfile[mytypescript] \usetypescript[MyIPAex] \setupbodyfont[Myface,rm,12pt] and the typescript file is in the same folder as the source files. What am I doing wrong? Thanks, Severin