Kaltura_Client_Exception thrown

Invalid KS "OWI3Mzc1MmNlYjUyYmNlZDllMjJmZmNiYTlkOGFjNDQzNzcxNTc2Y3wxMDE7OzE0ODUzNjYwNjM7MjsxNDg1Mjc5NjYzLjM3MjM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"