Kaltura_Client_Exception thrown

Invalid KS "NjViNWViOWM1MDgwYTMxZTQzODRiMmEyYjIyODZiMzk4MjdlOGEzNXwxMDE7OzE0NjcwMjkxMjY7MjsxNDY2OTQyNzI2LjQ2O0Fub255bW91cztlZGl0Oio=", Error "-1,INVALID_STR"