使用uwsgi搭建运行python项目报错？

Question

报错信息如下：

*** Operational MODE: threaded ***
unable to load app 0 (mountpoint='') (callable not found or import error)
unable to find "application" callable in file /www/wwwroot/www.pptpai.cn/pngpai
unable to load app 0 (mountpoint='') (callable not found or import error)'

*** no app loaded. going in full dynamic mode ***
*** uWSGI is running in multiple interpreter mode ***
spawned uWSGI master process (pid: 26137)
spawned uWSGI worker 1 (pid: 26138, cores: 2)
spawned uWSGI http 1 (pid: 26139)