After installing SMI you may receive an HTTP 500 Internal Server Error with the following message:
"Cannot add duplicate collection entry of type 'add' with unique key attribute 'name' set to 'ManagementInformation' "
In the Web.Config, the SMI module is added to the list of modules in the Web.Config file. You probably have a section in the Web.config file for <location path="cms"> ... </location>. In this section you must remove the SMI module by using the following line.
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<remove name="ManagementInformation" />
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When you add this line, the ManagementInformation module will not be loaded for the Cms application in IIS and the error will no longer occur.
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