The application server could not be contacted

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PostgreSQL 9.6升级到PostgreSQL 10后,在使用的过程中,过去的pgAdmin 3出现了很多问题,无法完全支持PostgreSQL 10
pgAdmin 4体验差,很糟糕就算了,关键是postgresql-10.3-1-windows-binaries压缩版中的pgAdmin 4无法启动,启动的时候会报出如下错误信息:
The application server could not be contacted
解决办法:在·venv\lib\site-packages\backports·目录下创建一个空的__init__.py

cd pgAdmin 4
type nul > venv\lib\site-packages\backports\__init__.py

参考:http://blog.csdn.net/pierian_d/article/details/79510309

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