The upload directory ($1) is not writable by the webserver.
The Mer Wiki now uses your Mer user account and password (create account on https://bugs.merproject.org/)
MediaWiki:Upload directory read only
From Mer Wiki
The Mer Wiki now uses your Mer user account and password (create account on https://bugs.merproject.org/)
The upload directory ($1) is not writable by the webserver.