Kaltura_Client_Exception thrown

Invalid KS "NWYwMGVkMmZkMzU0NTRiNzJlMDVhZDI5Zjg5MmIyOTVkNGVkZWRkM3wxMDE7OzE0NzU0NDg4NzI7MjsxNDc1MzYyNDcyLjcwNjc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"