Kaltura_Client_Exception thrown

Invalid KS "MzI0ZTlhYTFlMmFhMGNjNmNjNzY2OGUzZTc1YzQ1YjlkYmM0NDRkNnwxMDE7OzE0OTM1MTA4NTc7MjsxNDkzNDI0NDU3Ljk3OTM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"