Kaltura_Client_Exception thrown

Invalid KS "YjljN2EwZjNlYWIyZGQ2NjJlNDcyYmFhMzZkZjQzYTM1NGFhNzE0NHwxMDE7OzE0NzQ4Njk2NTI7MjsxNDc0NzgzMjUyLjkzO0Fub255bW91cztlZGl0Oio=", Error "-1,INVALID_STR"