Kaltura_Client_Exception thrown

Invalid KS "NGUzMzY5Njk0NzdiYzQ2YzZjNmQzMjY1MmUyNjBjYTk4M2Y3ODYzNXwxMDE7OzE0NzUwNjAzNDY7MjsxNDc0OTczOTQ2LjgyNjE7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"