Kaltura_Client_Exception thrown

Invalid KS "N2M5ZDRmOWE3YjViYzkwN2RkYjdkYmExZDNjZThjYThhNGQxZTFiMXwxMDE7OzE0ODUxOTU5ODE7MjsxNDg1MTA5NTgxLjcxNDY7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"