Kaltura_Client_Exception thrown

Invalid KS "OTFhMzg3YmIxMDYxZDZiYzdmNDY2NDJiOTFkZjY2YjkwZWNiOTM4NHwxMDE7OzE1MDExMzc5Mzk7MjsxNTAxMDUxNTM5Ljc2NDI7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"