SSIS 2012: Error 21 System.ArgumentException: An item with the same key has already been added. at System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean)
In SSIS 2012 when we have Project connection manger and package connection manager with the same name then we will get this error . Error 21 System . ArgumentException : An item with the same key has already been added . at System . ThrowHelper . ThrowArgumentException ( ExceptionResource resource ) at System . Collections . Generic . Dictionary ` 2. Insert ( TKey key , TValue value , Boolean add ) at Microsoft . SqlServer . Dts . Runtime . ReferenceId . ReferenceMap . Add ( String key , String value , Boolean isExternal ) at Microsoft . SqlServer . Dts . Runtime . ReferenceId . RefIdProducer . AddRefIdAttribute ( XmlElement element , String objectName , String objectId , ReferenceParserState state ) at Microsoft . SqlServer . Dts . Runtime . ReferenceId . RefIdProducer . GenerateRefId ( XmlElement element , ReferenceParserState state ) ...