If you are facing this issue then your base URL is incorrect.

When the base URL is incorrect, the images will not appear and CometChat will fail to function.

The BASE_URL is usually /cometchat/ when the CometChat folder is uploaded to the root.

To modify the Base URL:

Log into Administration Panel => Settings tab => Change Base URL => Change the path => Update Settings

For example,

1) If CometChat is accessible at the URL: http://www.demosite.com/dev/
cometchat, then BASE_URL should be “/dev/cometchat/” (no quotes).

2) If CometChat is accessible at the URL : http://www.demosite.com/dev/
forum/cometchat, then BASE_URL should be “/dev/forum/cometchat/” (no quotes).

3) If CometChat is installed in cross-domain environment and is accessible at the URL http://chat.demosite.com, then BASE_URL should be “http://chat.demosite.com/” (no quotes).