Blocking Task Changes in 5.5? (Server.findAllForType() issues)

I have a short script that I run to quickly kill all tasks that I have running in vCD for testing purposes.

it is as follows:

var blockingTasks = Server.findAllForType("vCloud:BlockingTask");

for each (var bt in blockingTasks)

{

    bt.abort("");

}

I am currently trying to migrate into a 5.5 environment from a 5.1 environment. When I run this exact same script in the new environment, it throws an error:

[2014-05-08 18:18:10.803] [I] Server error : ch.dunes.model.sdk.SDKFinderException: Unable to execute 'fetchAll' for type : BlockingTask

I don't see any deprecation in the documentation, so I assume I am doing something wrong.... can anyone help me?