Kaltura_Client_Exception thrown

Invalid KS "YWEwYzA0OTYzYzM4Mjk3MGNlNzE0Y2VmYWI3NWFiNzg0MThiYzJiZnwxMDE7OzE0Njk4OTUzODM7MjsxNDY5ODA4OTgzLjgzMDk7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"