Thank you very much Wolfgang. You were a big help, as usual. It never 
came to my mind, that the Textadept lexer file /context.lua/ in my 
working directory could interfere with /mtxmrun/, which is located 
elsewhere. I should also have tried to process files from another 
directory instead of trying it from another PC. But since on my tablet 
PC I only have one single TeX directory, it didn't come to my mind to 
try another one. So again, thank you.

Cheers, Lars.

P. S.: From what I read so far you're a real TeX genius. It's always a 
pleasure to write with you.

P. P. S.: Some people really should learn from you, not only when it 
comes to TeX.


Am 08/09/2018 um 18:42 schrieb Wolfgang Schuster:
> mtxrun loads the wrong lua file, while it should load mtx-context.lua 
> it actually uses context.lua.
>
> Since there is no context.lua in the distribution I guess context.lua 
> is one of your files you put in the text directory, remove this file 
> (or put it in a different folder) and ConTeXt should work again.
>
> Wolfgang
>
>
> Lars schrieb am 08.09.18 um 18:00:
>>
>> Hello list,
>>
>> since one of the last beta updates (now I have 2018.09.01) I can't 
>> use ConTeXt on my Win 10 32bit tablet anymore. I can't make PDFs 
>> because I get an error message. In fact, with CTX in my system path 
>> of course, even when I type the following into my command prompt, I 
>> get the same error:
>>
>> mtxrun --script context
>>
>> ./context.lua:11: attempt to call a nil value (method 'add_rule')
>>
>> This could have to do with the last adaption to Textadept 10. On my 
>> Win 10 x64 PC there is no problem. Any clues?
>>
>> Cheers and thanks, Lars.
>>
>>
>>
>> ___________________________________________________________________________________
>> If your question is of interest to others as well, please add an entry to the Wiki!
>>
>> maillist :ntg-context@ntg.nl  /http://www.ntg.nl/mailman/listinfo/ntg-context
>> webpage  :http://www.pragma-ade.nl  /http://context.aanhet.net
>> archive  :https://bitbucket.org/phg/context-mirror/commits/
>> wiki     :http://contextgarden.net
>> ___________________________________________________________________________________
>