Database recovery

Hi list!!
 
I am doing a database recovery by following some examples I found in the SAPDB 
manuals and also in the internet. Beyond, you will find the commands and also 
the error I get:
 
C:\>dbmcli -uUTL -d siscodb -u dbm,dbm
dbmcli on siscodb>medium_getall
OK
logsave LOG     FILE    LOG     0       0       NO      NO              20040624
194827  20040624194827
datasave        DATA    FILE    DATA    0       0       NO      NO
20040624194844  20040624194844
---
dbmcli on siscodb>recover_start datasave
ERR
-24988,ERR_SQL: sql error
-3005,Invalid SQL statement
---
dbmcli on siscodb>
 
Best regards,
Jonathan