new MessageConsole("MyConsole" null) error!该怎么解决

new MessageConsole("MyConsole", null) error!
when   i   run   the   following   sentence   in   my   plugin:

MessageConsole   console   =   new   MessageConsole( "MyConsole ",   null);

it   throws   org/eclipse/jface/text/BadPositionCategoryException...

i   hope   to   print   informations   on   the   console.   can   any   one   help?   Thx   a   lot

[解决办法]
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