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I Created a web part and add Event Receiver to handle ItemAdded event.

When run in visual studio , i get error

Error occurred in deployment step 'Activate Features': Attempted to perform an unauthorized operation.

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up vote 0 down vote accepted

Couple of questions

  1. Are you deploying via Visual Studio? or Installing using STSADM/Powershell?

  2. Did you follow the guidelines for setting up your permissions to deploy from Visual Studio - Read here for those steps:

The "unauthorized operation" is a very generic error and doesn't always tell you where you dont have permissions.

The link shared above though should help.

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