The issue happens because your web browser, safari, is blocking cookies, which is a default setting.
To resolve the issue, please follow the steps below.
Step #1 : Click Safari > Preferences
Step #2 :
In Safari 5.1 or later
In the window that opens, click Privacy, and select "Never".
In Safari 5.0 or earlier
In the window that opens, click "Security", and select "Always".
Step #3 :Close the Privacy or Security window.