Created Unassigned: Ajax Control Toolkit .NET 4.0. The debugger could not locate the source file 'd:\hg\act\Server\AjaxControlToolkit\ExtenderBase\ScriptControlBase.cs' [27640]

I installed the Ajax Control Toolkit .NET 4.0, file version 4, 1, 4012, 2
When I run my app in debug I get the following error:

Locating source for 'd:\hg\act\Server\AjaxControlToolkit\ExtenderBase\ScriptControlBase.cs'. (No checksum.)
The file 'd:\hg\act\Server\AjaxControlToolkit\ExtenderBase\ScriptControlBase.cs' does not exist.
Looking in script documents for 'd:\hg\act\Server\AjaxControlToolkit\ExtenderBase\ScriptControlBase.cs'...
Looking in the projects for 'd:\hg\act\Server\AjaxControlToolkit\ExtenderBase\ScriptControlBase.cs'.
The file was not found in a project.
Looking in directory 'C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\crt\src'...
Looking in directory 'C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\atlmfc\src\mfc'...
Looking in directory 'C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\atlmfc\src\atl'...
Looking in directory 'C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\atlmfc\include'...
The debug source files settings for the active solution indicate that the debugger will not ask the user to find the file: d:\hg\act\Server\AjaxControlToolkit\ExtenderBase\ScriptControlBase.cs.
The debugger could not locate the source file 'd:\hg\act\Server\AjaxControlToolkit\ExtenderBase\ScriptControlBase.cs'.