Error: "The restore operation cannot proceed because the secondary database is not in NORECOVERY/ (4225030)

Eror may display:
"10/10/2011 10:20:00,LSRestore_SERVERNAME_AdventureWorks,Error,1,SERVERNAME\INST1,LSRestore_SERVERNAME_AdventureWorks,Log shipping restore log job step.,,Executed as user: SERVERNAME\SYSTEM. The step failed.,00:00:03,0,0,,,,0
10/10/2011 10:20:00,LSRestore_SERVERNAME_AdventureWorks,Unknown,1,SERVERNAME\INST1,LSRestore_SERVERNAME_AdventureWorks,Log shipping restore log job step.,,2011-10-10 10:20:03.59 *** Error: The restore operation cannot proceed because the secondary database 'AdventureWorks' is not in NORECOVERY/STANDBY mode.(Microsoft.SqlServer.Management.LogShipping) ***<nl/>2011-10-10 10:20:03.62 Deleting old log backup files. Primary Database: 'AdventureWorks'<nl/>2011-10-10 10:20:03.62 The restore operation completed with errors. Secondary ID: '3fb8605f-6027-496a-822c-ddbf932a57a5'<nl/>2011-10-10 10:20:03.62 ----- END OF TRANSACTION LOG RESTORE -----<nl/><nl/>Exit Status: 1 (Error),00:00:03,0,0,,,,0"