Kaltura_Client_Exception thrown

Invalid KS "ZmM2NmMwZDRhNmM0YjIwMjdiMzFiOGViM2NmZjUxNjQzZmUwZjNmZnwxMDE7OzE0OTM1ODEwNDY7MjsxNDkzNDk0NjQ2LjM1Njk7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"