Kaltura_Client_Exception thrown

Invalid KS "ZWRlNTc0ZTRiYjEwM2RjYTNjOGNlMmEwMjZlMzUyZDcxYmRiYTY0NnwxMDE7OzE0ODUwMTUyMzY7MjsxNDg0OTI4ODM2Ljk5Mzk7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"