User has option to edit custom xml to create a workflow. When workflow content is invalid, there is no explanation for the error on screen or in logs.
1. From Control Panel > Kaleo Designer create a new workflow
*Note that it only has 2 nodes, StartNode and EndNode
2. Click on 'Source' tab
3. Give the workflow a title
4. Edit the xml content to make it invalid, ie. remove just the end tag
As workflow definition is invalid, error message "Error: Please enter valid content" is displayed but is missing details to indicate which error it is in logs or screen