Service Broker Messages

Hi,

I've the below messages appearing in the sql error logs plenty of times. No idea what's the problem. Any insight ?

spid25s	The query notification dialog on conversation handle '{8BCD7D78-1340-E411-A2AF-0050569D1B40}.' closed due to the following error: '<?xml version="1.0"?><Error xmlns="http://schemas.microsoft.com/SQL/ServiceBroker/Error"><Code>-8490</Code><Description>Cannot find the remote service &apos;SqlQueryNotificationService-34610a75-1b8a-427b-9d14-076b22dff07e&apos; because it does not exist.</Description></Error>'.
spid59	Error: 28054, Severity: 11, State: 1.
spid59	Service Broker needs to access the master key in the database 'MyData'. Error code:26. The master key has to exist and the service master key encryption is required.