Error installing app

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1

Hi,

Trying to install Shaarli or Custom Webapp apps, I get this error:

2017-06-29 20:05:24,265 ERROR    yunohost.app app_install - [8330.94] Une erreur inattendue est survenue
Traceback (most recent call last):
  File "/usr/lib/moulinette/yunohost/app.py", line 729, in app_install
    args=args_list, env=env_dict, user="root")
  File "/usr/lib/moulinette/yunohost/hook.py", line 350, in hook_exec
    command.append(cmd.format(script=cmd_script, args=cmd_args))
ValueError: unmatched '{' in format

How can I handle it?

Thanks!