Kaltura_Client_Exception thrown

Invalid KS "YjI5Nzc2NjNiMmQwMzg3ZTU3OThkNDYyOWIyYzZhMmQ2MWQ1NWExMHwxMDE7OzE0Njk4MzkyMDU7MjsxNDY5NzUyODA1LjMwNTc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"