Run the sdegdbrepair tool on the feature class or table that the error is encountered on using the -V option to specify the version to repair or use -V ALL to repair all versions.ArcSDE 9.1 Repair Utility<a href="http://support.esri.com/index.cfm?fa=downloads.patchesServicePacks.viewPatch&PID=19&MetaID=1173" target="_blank">http://support.esri.com/index.cfm?fa=downloads.patchesServicePacks.viewPatch&PID=19&MetaID=1173</a>