you need to clear the documents on the Client queue as the Storage for the Broker Server is exhausted.
Clearing a Client Queue
1 In My webMethods: Messaging > Broker Servers > Clients.
2 In the Client List, click the client ID of the client for which you want to clear the queue.
3 On the Client Details page, click the Statistics tab.
4 Under Client Queue, next to the Length field, click Clear Queue.
Once done, you would be able to publish the Canonicals.
One can also increase the Storage Size of the Broker Server by specifying appropriate space for the log file or storage files.
#webMethods#Integration-Server-and-ESB#broker#Universal-Messaging-Broker