Kaltura_Client_Exception thrown

Invalid KS "NjE1MzZjZTkyOWVmMmZhMmI1NThjZTE5MDNmOTc2MTQyZDE1YzM5ZHwxMDE7OzE0NzQ5Njc3NTI7MjsxNDc0ODgxMzUyLjUwMjM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"