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I have developed a sln that is composed of 3 different web parts. Everything was working fine, but I renamed the project and assembly at the request of conforming to a naming convention. I deleted the web parts from the wp gallery, retracted the sln and redeployed the newly renamed project. When attempting to preview my web parts in the web parts gallery I receive the error:

Microsoft.SharePoint.ApplicationRuntime.SafeControls+UnsafeControlException: A Web Part or Web Form Control on this Page cannot be displayed or imported. The type is not registered as safe.

I have checked the web.config to verify that my web parts are under <SafeControls> and that the namespace is correct. I've checked each web parts .spdata file to check that everything is correct there as well.

Now, I rolled back my sln to the point in time when my project was working (via TFS), deleted the web parts from the gallery, retracted the sln and redeployed once again. I thought reverting back to the working sln would solve my problem, but unfortunately I am met with the UnSafe exception again.

Can anyone provide any further thoughts into my situation? I'm running out of places to look. Thanks!

  • Are the Version & PublicKeyToken numbers the same between the web.config's safecontrol entry and the assemblies in the GAC? – Mike Lutge Aug 8 '14 at 18:44
  • @MikeLutge Thanks for the reply. The version & PublicKeyToken between the safecontrol enty and the GAC assembly is the same – KidBatman Aug 8 '14 at 19:00
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You should try delete wsp and install again. We apply this formula and the program was working.

  • Retracting and redeploying the .sln = delete wsp and install again. – Jussi Palo May 4 '18 at 10:22

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