Kaltura_Client_Exception thrown

Invalid KS "ZTAzNGQ4NjM3MDI5NDQ5NGM1M2I4YzcyMTZjOTQxMGU0ZmVhNWRkOXwxMDE7OzE0NzUyNzQ0Mzk7MjsxNDc1MTg4MDM5LjI4NjM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"