You get that error page because there is an error in the service being run.
What does the error message tell you the problem is? Have you followed any advice given in the error message? If it's not giving you anything to work with, can you read the <jira home>log/atlassian-jira.log file to find out the detail of the error?
I have multiple projects that use variations of the same base workflow. The variations depend on the requirements of the project or issue type. The variations mostly come in the form of new statuses ...
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