Kaltura_Client_Exception thrown

Invalid KS "MmJkODg0ZjkyYmUyNTE3NWRmZGM5NzQ2YzZmZmFmNjJlZDZlYTgxN3wxMDE7OzE0NzUzNjY2Mjg7MjsxNDc1MjgwMjI4LjQ5MTc7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"