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Thank you Piet
It was a server issue.
I've got the same problem and don't find any solution. Dir exists, permissions set on chmod777 and the server machine is main. I still don´t know how to fix it.
Try to find out if the variable open_basedir is configured in the php.ini of your server. If this variable is defined and the data directory is not included in list of allowed directories the webserver can't access the directory even if it exists and the permissions are correct.