I've installed DataObjectManager successsfully (as far as I can see anyway), and I've installed the swfupload module. I don't see anything in the tutorial about installing 'image gallerie'. Is there another module I need?
Just one thought; is it important what the directory name is?
When I unzipped the dataobject_manager .zip file, it gave me a folder called "modules-dataobject_manager-r148", so I retained that name. I then also tried renaming the folder "dataobject_manager" but it made no difference.
I now have all those modules installed and I have a page-type of "Image Gallery" that I can use. (It's not quite what I was after, but I'll work with it for a bit and see if I can get it to do what I want.)
However, on the photos tab, if I try to add an image to a gallery, I get this error:
Line 444 in D:\wamp\www\SilverStripe\sapphire\core\Requirements.php
Looks like you might have some misunderstandings about the DataObjectManager. It does not give you a new page type to create. It's will allow you to use a new form field called DataObjectManager in your Page classes. I'm not sure what you mean about the testimonials page. I had included that as an example, but it is by no means a core part of the module -- just something there for your reference.
Also, when installing dataobject_manager or swfupload, there is a text file in that tells you to drop the adjacent folder into your Silverstripe root. You shouldn't be using the top level folder because Silverstripe adds those "-r123" suffixes to the file.
Can you confirm that the file swfupload_vars.js is where it's supposed to be?