Strange error message

Hi everyone,

can please somebody let me know what this error message is supposed to mean:
ERROR:  could not open relation 1663/16858/9469857: Permission denied

Strange thing about it is that i do not have a relation with that name.
This somehow seems to go along with this other strange error message:
2006-08-01 05:08:22 LOG:  archived transaction log file "0000000100000020000000D2"
2006-08-01 05:11:47 LOG:  archived transaction log file "0000000100000020000000D3"
2006-08-01 06:06:32 LOG:  archive command "copy pg_xlog\0000000100000020000000D2
C:\Archiv\DBArchiv\0000000100000020000000D2"failed: return code 1  
2006-08-01 06:06:33 LOG:  archive command "copy pg_xlog\0000000100000020000000D2
C:\Archiv\DBArchiv\0000000100000020000000D2"failed: return code  
1 2006-08-01 06:06:34 LOG:  archive command "copy pg_xlog\0000000100000020000000D2
C:\Archiv\DBArchiv\0000000100000020000000D2"failed: return code 1 
 2006-08-01 06:06:34 WARNING:  transaction log file "0000000100000020000000D2" could not be archived: too many failures

Postgre copied the file 0000000100000020000000D2 to the specified directory and now it says it can't be copied...I
really,really don't get it! 

--
Christian Rengstl M.A.
Klinik und Poliklinik für Innere Medizin II
Kardiologie - Forschung
Universitätsklinikum Regensburg
B3 1.388
Franz-Josef-Strauss-Allee 11
93053 Regensburg
Tel.: +49-941-944-7230