The problem, as described in the warning message, is the permissions of the folder you created are not allowing the writing of the cache file. If you used ftp to create the folder the webserver that is serving the application, probably apache, is not allowed to write to folders created by the ftp user. You can see file permissions in ftp clients like filezilla. The problem should be fixed when you correct the permissions on the folder that was created.
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This reply was modified 7 years, 2 months ago by xachman.