backup database by maintenance plan

1. create new MaintenancePlan to get a full backup of myDb by Wizzard,... the message is:
create failed for JobStep 'Subplan' ... the specified '@.subsystem' is invalid .. Error 14234

2. create new MaintenancePlan without the Wizzard, by drag and drop "Back Up Database Task" and configured to full backup myDb scheduled daily the message is: create failed for Job 'MaintenancePlan'
the plan exists without scheduling, after modifying get the message
Guid should contain 32 digits with 4 dashes (xxxxxxxx-xxxx-xxxx-xxxx-...).
? can I get help ? - Thanks

sorry, the problem was solving by installation SSIS - Integration Services... Greetings!|||Thx! After installing SSIS, this strange problem was happily solved!!|||

There is a KB article to resolve the above error.

http://support.microsoft.com/?kbid=922651