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Custom DataFlow component causes - "Value of 'null' is not laid for 'stream'." Exception in SSDT 2012 w/BI

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Hi I developed a custom data flow component in SSDT 2012 (VS2012) as a C# assembly. I signed it, built it, copied it to ..\program files (x86)\Microsoft Sql server\110\assemblies\pipelinecomponents and registered it in the GAC and everything appears normal. when i add it to the data flow of an SSIS package created in SSDT2012 an connect the source adapter, i double click the custom component to edit it and it throws the following exception: "Value of 'null' is not laid for 'stream'." The annoying thing is there is no further info. Thinking I missed something. Tried the same SSDT 2012 component in an SSDT 2010 created package and all seems ok and I can seethe editor UI for the component. Ami missing something n SSDT 2012? Regards Barry

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