Yet another "not found. Please check that the block controller file contains the correct class name."

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Hi guys. I'm getting a strange one here with tnSpacer1.2. I get no other error messages apart from

"not found. Please check that the block controller file contains the correct class name."

Doesn't even tell us what is not found. Strange.

I have two Concrete installations on my site. One in the web root and one in a directory which is for someone else. Installing blocks in the web rooted version is fine, no issues at all. It's the one in the directory that is causing problems. :(

I checked site.php and it seems to be pointing to the right place:

define('BASE_URL', 'http://arblickspule.co.uk');
define('DIR_REL', '/wincar');

The addon appears in the "add functionality" page but I cannot add it to any pages.

Cheers in advance!