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Error in language generation

Hi
I try to generate a new language file in erpnext and i get an error “too many values to unpack (expected 2)”
Do you need some more information?
Thanks for help
Cheers Sascha

~/frappe-bench$ bench new-language ch erpnext
Traceback (most recent call last):
File “/usr/lib/python3.8/runpy.py”, line 194, in _run_module_as_main
return _run_code(code, main_globals, None,
File “/usr/lib/python3.8/runpy.py”, line 87, in _run_code
exec(code, run_globals)
File “/home/bench/frappe-bench/apps/frappe/frappe/utils/bench_helper.py”, line 99, in
main()
File “/home/bench/frappe-bench/apps/frappe/frappe/utils/bench_helper.py”, line 18, in main
click.Group(commands=commands)(prog_name=‘bench’)
File “/home/bench/frappe-bench/env/lib/python3.8/site-packages/click/core.py”, line 764, in call
return self.main(*args, **kwargs)
File “/home/bench/frappe-bench/env/lib/python3.8/site-packages/click/core.py”, line 717, in main
rv = self.invoke(ctx)
File “/home/bench/frappe-bench/env/lib/python3.8/site-packages/click/core.py”, line 1137, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File “/home/bench/frappe-bench/env/lib/python3.8/site-packages/click/core.py”, line 1137, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File “/home/bench/frappe-bench/env/lib/python3.8/site-packages/click/core.py”, line 956, in invoke
return ctx.invoke(self.callback, **ctx.params)
File “/home/bench/frappe-bench/env/lib/python3.8/site-packages/click/core.py”, line 555, in invoke
return callback(*args, **kwargs)
File “/home/bench/frappe-bench/env/lib/python3.8/site-packages/click/decorators.py”, line 17, in new_func
return f(get_current_context(), *args, **kwargs)
File “/home/bench/frappe-bench/apps/frappe/frappe/commands/init.py”, line 26, in _func
ret = f(frappe._dict(ctx.obj), *args, **kwargs)
File “/home/bench/frappe-bench/apps/frappe/frappe/commands/translate.py”, line 35, in new_language
frappe.translate.write_translations_file(app, lang_code)
File “/home/bench/frappe-bench/apps/frappe/frappe/translate.py”, line 703, in write_translations_file
write_csv_file(os.path.join(tpath, lang + “.csv”),
File “/home/bench/frappe-bench/apps/frappe/frappe/translate.py”, line 593, in write_csv_file
for p, m in app_messages:
ValueError: too many values to unpack (expected 2)