Error in user task

Question

Hello all,
in a customer project, we have run into an issue while trying to assign a task to an user (synchronized from the customers LDAP).
The server log file gives the following message:
A non-retryable Exception has occured: Attribute: out_of_office_user_id on object: workflow_user:[1AF8AB1E-8254-323F-81E4-606D7FF392C1] has not been loaded.
The "allow out of office designation" options are turned OFF in the user task. Is there anyone who knows what this error REALLY means?
Thank you very much,
Steffen.

Answer 1

Thank you all for your quick responses!
After playing around for a while, I noticed that the issue really only occurs with one specific user account. When I directly assigned the task to this account everything worked just fine. After that, the xPath option worked as well. It really looks like if something is being synchronized into the LC database when a user account has it's first contact with a workflow. If that step could be completed the issue never occurs again - which sounds pretty much in line with what Yog said.
The only difference with the "erroneous" user account seems to be that the family name contains a whitespace - I have no idea if this is relevant.
I'm not able to apply the service pack immediately for some reason, but we'll soon be able to see if that fixes the issue.
Thanks again,
S.