Kaltura_Client_Exception thrown

Invalid KS "N2JkMDUxZWU2NTdlOWNlMWE2MTZhMGEwODNlYmFkOTUxMzI2MzZkZXwxMDE7OzE1MDEwMDA4NjY7MjsxNTAwOTE0NDY2LjE1Mjk7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"