Kaltura_Client_Exception thrown

Invalid KS "Y2FmZGRhOGM1NmE1ZDkxNjQwZWRlOWIwOWJkMzUyODU4YjQzZjkwYXwxMDE7OzE0NzIyNTAzMzU7MjsxNDcyMTYzOTM1LjkyMzk7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"