Clicking on View Workflow in issue view results in pop-up error
Platform Notice: Data Center Only - This article only applies to Atlassian products on the Data Center platform.
Note that this KB was created for the Data Center version of the product. Data Center KBs for non-Data-Center-specific features may also work for Server versions of the product, however they have not been tested. Support for Server* products ended on February 15th 2024. If you are running a Server product, you can visit the Atlassian Server end of support announcement to review your migration options.
*Except Fisheye and Crucible
Symptoms
When you click on a the "View Workflow" link in an issue view, a pop-up with an error shows instead of a map of the workflow
The pop-up error looks like:

The following appears in the atlassian-jira.log
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2012-03-15 16:12:03,497 http-8080-3 ERROR admin 972x205x1 19b9a6j 172.28.15.210 /plugins/servlet/workflow/thumbnail/getThumbnail [atlassian.jira.workflow.OSWorkflowManager] Could not get workflow called: Copy : com.opensymphony.workflow.FactoryException: Unknown workflow name
com.opensymphony.workflow.FactoryException: Unknown workflow name
at com.opensymphony.workflow.config.DefaultConfiguration.getWorkflow(DefaultConfiguration.java:86)
at com.atlassian.jira.workflow.OSWorkflowManager.getWorkflow(OSWorkflowManager.java:187)
at com.atlassian.jira.bc.workflow.DefaultWorkflowService.getWorkflow(DefaultWorkflowService.java:293)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
Cause
There are special characters in the workflow name. Special characters in html in this context do not render correctly.
Resolution
Migrate your current project's workflow to a workflow with no special characters in the name
Create a copy of your workflow and workflow scheme
Assign your new workflow to your workflow scheme
Make assignments accordingly to capture different Issue Types
Assign the workflow scheme to your project
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