Error upon adding configuration (After Katmai uninstall)

Hi guys. This problem is somewhat related to my other problem here. This time, whenever I add a configuration file to a package I get the an error

Constructor on type 'Microsoft.DataWarehouse.Wizards.WizardInitializer' not found (EnvDTE).

All these weird messages came out after I uninstalled Katmai June CTP. I already employed similar solutions suggested by the kind people in the thread of my first problem. I'm just not sure which wizard file and registry key to modify.
It was fixed after I installed July CTP