Kaltura_Client_Exception thrown

Invalid KS "OWI2MGM3NjJlMmMzN2U0ZTAzYTdiYzU2MWJmYWM3NTRiOThlYTkzOHwxMDE7OzE0OTMxMjA5OTM7MjsxNDkzMDM0NTkzLjg2Njc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"