mysqldump error 1064 for database Use command

[Manasi Save]

Hi All,
 
I have 10 mysql databases all the tables use MyIsAm mysql storage engine. 
Database names are 1,2,3,4,...10.
 
When I use mysqldump command with --all-databases option. This gives me following error:
 
mysqldump -u myuser -p --all-databases > AllNew_Databases_20100904.sql
 
ERROR MESSAGE :-
 
mysqldump: Couldn't execute 'use 1': You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '1' at line 1 (1064)
 
Can anyone provide any input on this. I have never got this error before. The backups uptill now was happening properly. Please let me know if I am missing out any information which should be provided to get more clear idea about this error.
 
Any input will be a great help. 
 
Thanks in advance.
--
Regards,
Manasi Save