ORA-04021: timeout occurred while waiting to lock object

From: pejantan4u <pejantan4u@xxxxxxxxx>
Date: Thu, 31 Jul 2008 03:04:42 -0700 (PDT)

Dear gurus,

I had this message when i tried to export a schema, please tell me why
this happens?

i ran this script, exp schema/schema@sid file=schema.dmp

thanks
.

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