From the snippet of source code that you posted, it looks like you are calling the underlying API directly rather than using the web services. All of the calls to the web services are made through the proxy classes described in the Web Service Developer document.
There is nothing wrong with calling the underlying API directly. It just requires more work to ensure that the various components used by Checkbox can properly load their configuration information. If you wish to continue making direct calls to the API, please contact support. We have just created a document and sample application that describes the extra steps you need to this.
-Noah
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