This error is a browser issue related to cookies. Clearing your cache will solve the problem:

In Chrome: Select the “Customise and control Google Chrome” icon in the Chrome (the three stripes on the top right) Select “More tools” – “Clear browsing data” and the option of “Cookies and other site and plugin data” Select Clear browsing data again. 

In Internet Explorer Select “Tools” then “Delete browsing history” then “Cookies and website data” and then “Delete”