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Server Error in '/ION' Application

Issue
The following error occurs when the user tries to access the 'diagrams' tab in PME web:

          

           Server Error in '/ION Application.
           Runtime Error
           Description: An exception occurred while processing your request. Additionally, another exception occurred while executing the custom error page for the first exception.
           The request has been terminated.



Product Line
Power Monitoring Expert 8.2 (could apply to any version)

Environment
PME Web > Diagrams (Webreach)

Cause
The Windows Application Log revealed that there is a second file (WebReach-new) in the WebReach folder:

    <Data>/ION</Data>
    <Data>E:\Program Files (x86)\Schneider Electric\Power Monitoring Expert DC Ed\system\WebReach\</Data>
    <Data>CHMGW9MN17</Data>
    <Data>
    </Data>
    <Data>7024</Data>
    <Data>w3wp.exe</Data>
    <Data>NT AUTHORITY\SYSTEM</Data>
    <Data>ConfigurationErrorsException</Data>
    <Data>Could not load file or assembly 'WebReach-new' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)
   at System.Web.Configuration.CompilationSection.LoadAssemblyHelper(String assemblyName, Boolean starDirective)

Resolution
In ...\system\WebReach\ folder, there should only exist one WebReach.dll file. Having a second file with prefix WebReach' caused this problem (in this case the second file is called WebReach-new.dll).
Moving the extra file (WebReach-new.dll) to another folder, resolved the problem.
 
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