Kaltura_Client_Exception thrown

Invalid KS "NzI4N2FjODQ1Y2YwZDM3NzJmZTFhZDBjOGQ2ZjQ0ODdkMDdiMGIzM3wxMDE7OzE0NzUwNDE3MjM7MjsxNDc0OTU1MzIzLjc3MTg7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"