def startInstance(self, navdata):
    self.userHandler = self.findHandlerByName('AVNUserHandler')
    if (self.userHandler is None):
        raise Exception('unable to find a user handler')
    self.imagesHandler = self.findHandlerByName('AVNImagesHandler')
    if (self.imagesHandler is None):
        raise Exception('unable to find an images handler')
    self.httpServer = self.findHandlerByName('AVNHttpServer')
    if (self.httpServer is None):
        raise Exception('unable to find AVNHttpServer')
    super().startInstance(navdata)
def startInstance(self, navdata):
    self.userHandler = self.findHandlerByName('AVNUserHandler')
    if (self.userHandler is None):
        raise Exception('unable to find a user handler')
    self.imagesHandler = self.findHandlerByName('AVNImagesHandler')
    if (self.imagesHandler is None):
        raise Exception('unable to find an images handler')
    self.httpServer = self.findHandlerByName('AVNHttpServer')
    if (self.httpServer is None):
        raise Exception('unable to find AVNHttpServer')
    super().startInstance(navdata)