Hi all!

I wanted to add an image gallery to my site. I have SilverStripe version 2.4.3 . Took the following steps:

• installed DataObjectManager (build date 2011-07-28)
  
• installed uploadify (modules-uploadify-r534.tar.gz)

so far everything (seemed to be) working o.k.

After that I installed ImageGallery (modules-image_gallery-r536.tar.gz). I had some issues with this module, decided to deal with them later, and tried to go back to the situation before. So I removed the image_gallery directory from the root of my SilverStripe installation, and did a /dev/build. No errors showed...
But if I go to (mysite)/admin/assets I get this error:

[User Error] Bad RecordClassName '' and $baseClass not set
GET /admin/assets/Line 2762 in /var/www/silverstripe/sapphire/core/model/DataObject.php  

What did I do wrong? And more important: how can I get back my admin/assets page?

Do you make any pages whilst the module was installed?

Yes, I did, but I also removed them before removing the ImageGallery module.

Good show, the thing with the sitetree is that the objects are versioned, so are never completely deleted... if you re-install the module does it work?

O.K., I re-installed the ImageGallery module. But my admin/assets page still gives me the same error.

hmmm sounds like there was something, but the ClassName has been blanked, try opening a SQL client and running this...

SELECT * FROM SiteTree WHERE ClassName = '';
SELECT * FROM SiteTree_live WHERE ClassName = '';
SELECT * FROM SiteTree_versions WHERE ClassName = '';

you might well find some records and they should not be there (i.e. delete them and then it might well work).

Thanks, Swaiba!
I allready figured out it must have something to do with the database. I'll try this later.

The last query of the three:

SELECT * FROM SiteTree_versions WHERE ClassName = '';

gave me 11 rows. I deleted them with

DELETE FROM SiteTree_versions WHERE ClassName = '';

Then I ran /dev/build, that showed: "* Removing orphaned versioned records". So far it looked good...
But now my /admin/assets page still gives me the same error!
I also noticed that my database still has these tables: ImageGalleryAlbum, ImageGalleryItem, ImageGalleryPage, ImageGalleryPage_Live, ImageGalleryPage_versions. Would it be save to "drop" these? It scares me a little to make changes to my database outside the CMS.