Kaltura_Client_Exception thrown

Invalid KS "YzI1MmMyNjA2ODgzOGVhNTI4YTY3OGVkZmMyZjgxZDBmMmQ4MjZjYXwxMDE7OzE0NzUyNDUyMDk7MjsxNDc1MTU4ODA5LjEyNzQ7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"