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JQuery Cycle must be installed in order to run the slideshow. Please go to Status Report for instructions.

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You might get this error if you are using Memcached . It means that you have restrated the server but you have not restarted the memcached again.

For restarting the memcached, login to your account using a program like Putty and run the following command 

/etc/init.d/memcached restart

OR

service memcached restart