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vs 2013 ef exception

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<div>I have vs 2013 and sql server 2008 express</div> <div>When i try to add ado ef since i installed oracle 12c this happen:
  1. Add a new Item, and choose ADO.NET Entity Data Model - you have done this
  2. Choose "Generate from Database"
  3. Click "New Connection"

i get the error :

"Exception has been thrown by the target of an invocation"(Very usefull exception message by the way)

I guess is a bug or something that oracle 12 c makes on system

can u help me to check if EF is ok?

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