I have resolved this issue. Using Firebug I was able to see extra details in the exception, the inner exception was a Request timed out. Since this process took more then a minute, sometimes it would go over 90 seconds, in those cases I would get this error, because the default timeout is 90 seconds. Once I added this section to my web.config, the timeout stopped.
<system.web>
<httpRuntimeexecutionTimeout="3600">
</httpRuntime>
</system.web>
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