Kaltura_Client_Exception thrown

Invalid KS "NDQ4NDE2NWUxYTQ0MDFkZjIzOWRkMGVkNDVkM2RkZmNhMTBlN2Q4MHwxMDE7OzE1MDExMDIxMzY7MjsxNTAxMDE1NzM2LjY3MjI7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"