[xwiki-devs] org.hibernate.StaleObjectStateException: Row was updated or deleted by another transaction

[sharans]

  As an administrator, when i tried to modify the access right of a
particular user and then when i click on save, it gives me an exception
saying

   org.hibernate.StaleObjectStateException: Row was updated or deleted by
another transaction(or unsaved-value mapping was incorrect).

  What does this mean and how do i get rid of this problem.....
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