Kaltura_Client_Exception thrown

Invalid KS "YzllMDM3ODI5NmM3NjA1NWUxMGM1YjE2YjE2Y2YwMmVmNWIyYTU2NnwxMDE7OzE0NzUxMTQ2NDU7MjsxNDc1MDI4MjQ1LjI4MzQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"