Kaltura_Client_Exception thrown

Invalid KS "N2I5MDE3YWE1Y2IxZDI2MTlkOTBkODM4YTFlNjUzOGRkNjczYzA5NHwxMDE7OzE0NzU0Mjk2NDY7MjsxNDc1MzQzMjQ2LjM3Njg7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"