Resolve Workflow Error: Symbol property has already been set on Sequence


When working in the Workflow Designer, users may encounter the message "Workflow Designer encountered problems with your document" accompanied by the following error code:

'Symbol' property has already been set on 'Sequence'.



So, why does this happen?

This error is casued by a known bug in the .NET 4.5 Framework. The error may appear on the local machine of an individual creating a workflow. It can affect JAMS users with any .NET Framework older than .NET 4.6.



To resolve the error message, install .NET 4.6 or newer on the local machine encountering the error:

Download .NET 4.6 or newer by visiting the Microsoft .Net Downloads Page and selecting the appropriate .NET version, 4.6 or higher. Follow the installation instructions given by Microsoft.



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