Kaltura_Client_Exception thrown

Invalid KS "NjgxMDEzMTUwNzBiMGNiMzY5ZWUwY2YxZjFlMjVkNTQ0MDg4ZGY4Y3wxMDE7OzE0NzU0MzU2OTc7MjsxNDc1MzQ5Mjk3Ljg3NTU7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"