Do you have a console access to you server? If yes, you should check the data directory, which you will find in your Nextcloud document root, and which is the default location of the log file.
Eventually you can try to navigate through the directory structure and download the log file using FTP. If this is not possible, I would recommend to contact the OVH support and asked them for help.
Unfortunately I don’t know the OVH hosting solution. Better would be to wait for someone how knows the environment better than me.
BTW, have you subscribed to a ready-to-use Nextcloud service or have you installed Nextcloud on your own? In the first case OVH definitely nee to help you, in the second case you should know in which directory you’ve installed the software.
... "Exception":"Error","Message":"Class 'OCP\\Config' not found","Code":0,"Trace":[{"file":"\/home\/spacepvpde\/DRIVE\/apps\/files_reader\/lib\/Hooks.php","line":41
That exception is logged in your log file which points to the files_reader app causing a problem. As you can see here a pull request exists which hasn’t yet been applied to the latest app version:
Due to the fact that the files_reader app seems not to be compatible with Nextcloud 17, I would recommend to deactivate it. Unfortunately you don’t have console access and therefore you cannot run an occ command to deactivate it.
What you can try to do is, to move the app directory (./apps/files_reader) to a folder outside the Nextcloud document root and see if this fixes the problem. But I personally never did that and cannot guarantee you that it will fix the problem.
