title: The type 'System.Web.UI.ScriptManager' is ambiguous: it could come from assembly
body: <p>When I run my asp.net app I get the error</p>
  
  <blockquote>
    <p>The type ‘System.Web.UI.ScriptManager’ is ambiguous:</p>
  </blockquote>
  
  <p>I am having the same problem this person is having <a href="http://forums.asp.net/t/1313257.aspx" rel="nofollow noreferrer">http://forums.asp.net/t/1313257.aspx</a> , when I change the 1.0.61025.0 to 3.5 and re-compile It resets it to 1.0.61025.0</p>
  
  <p>what I can I do to resolve this. I've been trying to get my app running for hours now.</p>
  
  <p>Thanks</p>
  
  <p>Edit ~ HELPPpppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppppp</p>
  
  <p>I see 2 system.web.extensions in the GAC. I tried to remove with gacutil.exe /u system.web.ext
  ensions, Version=1.0.61025.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35
  Microsoft (R) .NET Global Assembly Cache Utility.  Version 2.0.50727.42
  Copyright (c) Microsoft Corporation.  All rights reserved.</p>
  
  <p>Unknown option: Version=1.0.61025.0
  what am I doing wrong.</p>
  
  <p>Edit ~ MY SOLUTION</p>
  
  <blockquote>
    <p>I went to "Add Remove Programs" and un-installed the Ajax Web Extensions 2.0 version 1.0.61025.0 </p>
  </blockquote>