ConfigurationException while using WSE 2.0

Question

I am trying to write a client for a webservice. I've configured app.config to have the following inside the configuration section:

where XXXXX is the actual public key token. However, when I try to run the client, I get the following exception: An unhandled exception of type 'System.Configuration.ConfigurationException' occurred in microsoft.web.services2.dll Additional information: WSE032: There was an error loading the microsoft.web.services2 configuration section. I'm assuming this means that it could not load app.config, or that it is formatted incorrectly. Has anyone seen this problem before or can point me to what I'm doing incorrectly? Thanks!