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In the configuration phase of continuous delivery the user that updated the settings became the default publisher of the virtual appliance versions that are published by continuous delivery process.
In the mean time, it is possible that the user was deleted from the AppDB. The only way to overcome this issue is to replace the default publisher by either:
NOTE: If this issue is kept unresolved for a long time, it is possible that the continuous delivery backend will automatically pause the process, until manually resumed by the author.