Kaltura_Client_Exception thrown

Invalid KS "ZmIyMDQ5YzMxZGJjYWU1YjVjYzQzZmYzOWM3NDY2MjBhYmVhYzYwOHwxMDE7OzE0NzUyMDEyMjI7MjsxNDc1MTE0ODIyLjczMTY7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"