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It appears that you have new messages waiting for you to read. By default, Moodle automatically shows a "Message window" when he/she get new messages. However, most browsers/toolbars are set to block popup windows and thus leads to the error.

One way to work around the problem is to configure the "Pop-up Blocker" of your Internet browser to allow popup windows from moodle.cuhk.edu.hk.
(1) Internet Explorer
(a) (b)
Another way is to disable new message alert in Moodle following the instructions below:
(1) Click on the link (your name & computing id) as shown below to view your profile.
(a)
(2) Click on the "Messages" button to display the “Message window”.
(a) (b)
(3) Click on the "Settings" tab
(4) Uncheck "Automatically show Message window when I get new messages"
(5) And click "Save my settings" button to confirm the change.
(a)
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