Kaltura_Client_Exception thrown

Invalid KS "ZWQ3NThiMDUwZDJmNmI5NjdmYTEzMGZlNjAyNTY1NTMzZDAxNDIxN3wxMDE7OzE0ODc4MTYwNzg7MjsxNDg3NzI5Njc4LjMzNDM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"