Kaltura_Client_Exception thrown

Invalid KS "Yzc5YTk2MGM4NjdkNDM1YmRiNjA3MDBmMGRlNDRjYWU4NTQ3MzlhOHwxMDE7OzE0OTg2NTM5Njg7MjsxNDk4NTY3NTY4LjM4MDk7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"