Kaltura_Client_Exception thrown

Invalid KS "YzllNGZlMDViZGQ1OTc4MjQ4OWUxNDFhMWZiM2Y4YjE3ZjMzMGQzM3wxMDE7OzE1MDExOTY2Njk7MjsxNTAxMTEwMjY5LjA3Mzc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"