AddIn does not start

Check the Logs in DiagViewer.

If it shows an ERROR in the GENERAL module which shows the exception:

Scada.Internal.DotNetAddInExtension.AddInIntegration.Startup Cannot startup Add-In .NET Extension for instance id 'e1d3....'. Exception information:System.InvalidOperationException The sequence does not contain a matching element. ...

...the reason for error is most likely in the AddIn itself.

The AddIn crashes before it reaches the 'Start' or 'Run' method. This could be because of a not existent library or a missing package. 

Check on the references of the AddIn and that they are available on the target machine. 

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