Kaltura_Client_Exception thrown

Invalid KS "MTE2YmU5ZjJiZDhmZGFkNTdmZTYzNWFhZjQ4OWFjOGUyYTc4MGIwNXwxMDE7OzE0NzUyNjI4NTU7MjsxNDc1MTc2NDU1LjExMjE7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"