Kaltura_Client_Exception thrown

Invalid KS "YmU5NTJmOGUwNjI1ZjUyNDhlNDMzMDMzNTQ1Y2ZlNGUwOThjNGNlMHwxMDE7OzE0OTg3OTUzMDg7MjsxNDk4NzA4OTA4LjE5ODM7QW5vbnltb3VzO2VkaXQ6Kg==", Error "-1,INVALID_STR"