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These errors would be normally reported to user on the list of Raley notifications just below the names of respective messengers. When you fix it, assuming that the fix was correct, the error message will disappear next time the current messenger is successfully run.

Why do I need "jirassimo" user?

When navigating to Raley configuration screen you might see the following warning:

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Raley AddOn is relying on existence of this user to handle events with JIRA issues and ServiceDesk requests. Specifically, this user profile is needed to check whether issue can be found by given JQL criteria that was specified in notification. If the user 'jirassimo' is not present, a runtime exception will be thrown. If you're not using JQL criteria for issues notifications then the AddOn will function properly even without this user available.

Also, 'jirassimo' user is needed to run digested notifications when issues are retrieved from JIRA under this user's permissions.

That said, if you need to restrict access of Raley AddOn to specific projects in JIRA you can do that by configuring access permissions on "jirassimo" user. 

How to group issues by status

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