Session prepare failed for session number string, serial number string
CauseA migration attempt was made, which failed because session prepare failed.
ActionRetry migration again after checking all arguments.
The Google Search results shown above are obtained by searching for this error using a custom google search engine which is restricted to a specific list of oracle reference sites. If you know a good oracle reference/help site and think that site should be included in this search, you can contribute to this search engine here.