Errors in Sending Messages with Chatter-jee

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Nothing to Save

It means you tried to save a conversation in a speak window when there was not a single character to save in the conversation text box.

Make sure conversation text box (upper text box in speak window) is not empty and try again.

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The User user has blocked you, so message could not be delivered

The recipient of the message you are trying to send has blocked you, either for this session, or permanently. Unless he/she removes you from blocked users list, you are barred from sending any messages to this user.