Kaltura_Client_Exception thrown

Invalid KS "Y2M2YjNiMTdhNGRhYzE4NTdlMDczMDU1YmZkNWQzN2JjMDU2MDE1NXwxMDE7OzE0OTA2NjM1NjY7MjsxNDkwNTc3MTY2LjI3MTE7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"