The SQL Server Service Broker for the current database is not enabled, and as a result query notifications are not supported...

This problem frequently occurs when you just restored a database, but service brokers are broken or lost.

To resolve this problem.

alter database xxxx set NEW_BROKER

Alternatively,

1. Go to Programs -> Microsoft Sql Server 2005 -> Configuration Tools -> Sql Server Surface Area Configuration -> Surface Area Configuration for Features.
2. Locate "Service Broker" under the database engine and enable it.