Error:
Cannot write into directory "/home/krienke/www/wetter/images"
as user "wwwrun" (UID: 30).
Write access to this directory is needed by gnuplot to temporarily store
image files representing the weather graphics.
Please change the owner of this directory or change the permissions
so that the user "wwwrun" (UID: 30) has permissions to create/read/write files in this directory.