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stuart gaganstuart gagan 

failed to connect with lightning experience

Can any help me, why contacts tab is not loading in lightning experience, it works fine in classic . when press F12 i am reciving below error.

WindowMessengerTimeoutError: Timeout exceeded waiting for handshake to complete from parent
    at new b (https://openq.na48.visual.force.com/jslibrary/1547586858218/sfdc/AuraAlohaFrameNavigator.js:98:84)
    at https://openq.na48.visual.force.com/jslibrary/1547586858218/sfdc/AuraAlohaFrameNavigator.js:113:345