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This article applies to: ML v7, ML8, MultiStore

500.19 Server error

500.19 Server error...

Cannot add duplicate collection entry of type 'add' with unique key attribute 'name' set to 'execpackage.aspx_*'

This is caused by duplicate keys in the web.config.

Replace the web.config file with a stock web.config file.  Make sure to change the dbconn, encrypt key and locale information of your web.config file after replacement.