Workflow Error - Failed on Start (retrying)

If you encounter this error message "workflow error - failed on start (retrying)" in visual studio .net workflow, you can try the following solutions to fix the issue:

• Change the Correlation Token value to be unique. The workflow and each activity should have a unique value. The workflow itself and each task you need to reference in the workflow must have a separate correlation token. Refer to this link http://msdn.microsoft.com/en-us/library/ms475438.aspx for more details. 

In the below example, I set the correlation token of the workflow in onWorkflowActivated1 to "workflowToken" and then the correlation token of the workflow task createEndorserTask to "taskToken".

Figure 1: workflowToken

Figure 2: taskToken

• Check the dll in the workflow.xml (CodeBesideAssembly). It should be the same as the one in the GAC.