[NTG-context] issue with current latest (2023.07.28 20:04)

Dear list, trying to generate the format for current latest (2023.07.28 20:04), I get this error message: tex error > tex error on line 280 in file lang-lab.mkxl: Control sequence expected instead of undefined \lang_labels_define_class_indeed {head}{ <macro> \definelabelclass ...ded {\lang_labels_define_class_indeed {#1}{\ifchknumber #2\or \lastchknumber \else \zerocount \fi }\expandafter \noexpand \csn ... \definelabelclass [head] [0] % titles <empty file> You injected something that confused the parser, maybe by using some Lua call. LuaMetaTeX is from 20230727 (just in case it might be relevant). Could anyone confirm the issue? Many thanks for your help, Pablo