Kaltura_Client_Exception thrown

Invalid KS "YjQ5ZTkyOWM3ZjFkZTFmMGY5NWNmYzgwYTVmNjMyMjFiMjEwODI3ZnwxMDE7OzE0ODEzMjE3MzA7MjsxNDgxMjM1MzMwLjQ3OTc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"