Recently we had to throw together a SharePoint Designer workflow in a hurry for a client. It consisted of 20 plus If Then Else statements that then triggered a separate custom task process.
About halfway through designing it, it started throwing the following error when publishing:
Unexpected error on server associating the workflow
I was able to determine that there was a default limit of 7000 on the UserDefinedWorkflowCompexity property of the web application. I used the follwoing PowerShell script to increase the limit and get passed the error:
$app = get-spwebapplication http://sharepointwebsiteurl/
$app.UserDefinedWorkflowMaximumComplexity = 30000
$app.Update()
After running this script, do an IISRESET and try publishing your workflow.
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