Kaltura_Client_Exception thrown

Invalid KS "NDUzZWRlNTQ5MzY5ZmQ3YjA1ZDhhMWJhZjUxYzk1MGUzMGVlNjIwOHwxMDE7OzE0OTM1NTEzNTc7MjsxNDkzNDY0OTU3LjI5MTM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"