Kaltura_Client_Exception thrown

Invalid KS "MGJkMjEzYWFmYTdhY2NkMjE0OTI1N2FiMzUwN2Q5MDYwMGJmMDk5OXwxMDE7OzE0NzUwNTkxNTg7MjsxNDc0OTcyNzU4LjE1Mjc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"