Kaltura_Client_Exception thrown

Invalid KS "ZjcxMGNkZjU3NDIyZjUzY2RiMjdiYjFlMjM5YzkyOTI0Y2Q1NDY0MnwxMDE7OzE0OTg1Njc4ODQ7MjsxNDk4NDgxNDg0LjEzODI7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"