Your PHP installation is running in safe_mode which is unsupported due to heavy file system restrictions.
What you can do:
- Change "safe_mode" to off in php.ini (if you run the server yourself).
- Ask your host to turn it off and alternatively use "open_basedir" which is less restrictive but still safe.
- Find a better host!
NOTE: A safe mode compatible version of MiniGal is being planned. Watch the website/forum for news about this