What version is your ubb again because that line is different on the current version.
But I suspect you don't have everything defined.
It depends on what image library you use and what you have.
For example if you are using imagemagick . You need to define the paths in the ubb control panel.
Or you are using GD2 and you need to select that in the ubb control panel.
Either case you would need to contact your host and as which oes you have ad for imagemagick you need a path.
