Kaltura_Client_Exception thrown

Invalid KS "MjJmMDI4ZmJhOTMxOTk4N2VjYzEzNzFkYmIwOTM2NDRiZjI3NDgzOHwxMDE7OzE0ODc3MjUwMjY7MjsxNDg3NjM4NjI2Ljc3ODI7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"