小编shr*_*rey的帖子

当我访问我的网站 ( https://osm-messaging-platform.appspot.com ) 时，我在主网页上收到此错误：

502 Bad Gateway. nginx/1.14.0 (Ubuntu).

这真的很奇怪，因为当我在本地运行时

python app.py

我没有收到任何错误，我的应用程序和网站加载正常。

我已经尝试过查找它，但是我在堆栈溢出中找到的大多数答案要么没有错误，要么与我无关。这是我查看 GCloud 日志时的错误：

019-02-07 02:07:05 default[20190206t175104]  Traceback (most recent 
call last):    File "/env/lib/python3.7/site- 
packages/gunicorn/arbiter.py", line 583, in spawn_worker      
worker.init_process()    File "/env/lib/python3.7/site- 
packages/gunicorn/workers/gthread.py", line 104, in init_process      
super(ThreadWorker, self).init_process()    File 
"/env/lib/python3.7/site-packages/gunicorn/workers/base.py", line 
129, in init_process      self.load_wsgi()    File 
"/env/lib/python3.7/site-packages/gunicorn/workers/base.py", line 
138, in load_wsgi      self.wsgi = self.app.wsgi()    File 
"/env/lib/python3.7/site-packages/gunicorn/app/base.py", line 67, in 
wsgi      self.callable = self.load()    File 
"/env/lib/python3.7/site-packages/gunicorn/app/wsgiapp.py", line 52, 
in load      return self.load_wsgiapp()    File 
"/env/lib/python3.7/site-packages/gunicorn/app/wsgiapp.py", line 41, 
in …

我最近尝试运行我的 flutter 应用程序。但是，当我尝试这样做时，出现以下错误：

An error was encountered processing the command (domain=NSPOSIXErrorDomain, code=3):\nApplication launch for 'com.[redacted]' did not return a valid pid \nnor a launch error.\nNo such process\nCommand: /usr/bin/arch -arm64e xcrun simctl launch AA375D1F-5CFC-4D1B-B367- \n4CB98488D7DA \ncom.[redacted] --enable-dart-profiling\n--enable-checked-mode --verify-entry-points --observatory-port=0\nError launching application on iPhone 13.\n

为了尝试解决这个问题，我运行了 flutter doctor，但出现了以下错误：

      See https://github.com/flutter/flutter/issues/6207 for more information\n\n[\xe2\x9c\x97] Android toolchain - develop for Android devices\n    \xe2\x9c\x97 Unable to locate Android SDK.\n      Install Android Studio from: https://developer.android.com/studio/index.html\n      On first launch it will assist you in …