Hello I went through the installation description of pgAdmin on https://computingforgeeks.com/how-to-install-pgadmin-4-on-centos-linux/
Installation was done on Centos8. After connecting to pgAdmin web site I got "server error" in browser and following messages in the error_log of Apache Are you able to advise what can be done? [Fri Nov 20 16:26:44.074222 2020] [wsgi:error] [pid 38774:tid 139824286275328] [remote ::1:55110] mod_wsgi (pid=38774): Exception occurred processing WSGI script *'/usr/lib/python3.6/site-packages/pgadmin4-web/pgAdmin4.wsgi'.* [Fri Nov 20 16:26:44.077629 2020] [wsgi:error] [pid 38774:tid 139824286275328] [remote ::1:55110] Traceback (most recent call last): [Fri Nov 20 16:26:44.077673 2020] [wsgi:error] [pid 38774:tid 139824286275328] [remote ::1:55110] File "/usr/lib/python3.6/site-packages/pgadmin4-web/flask/app.py", line 2309, in __call__ [Fri Nov 20 16:26:44.077677 2020] [wsgi:error] [pid 38774:tid 139824286275328] [remote ::1:55110] return self.wsgi_app(environ, start_response) [Fri Nov 20 16:26:44.077682 2020] [wsgi:error] [pid 38774:tid 139824286275328] [remote ::1:55110] File "/usr/lib/python3.6/site-packages/pgadmin4-web/pgAdmin4.py", line 72, in __call__ [Fri Nov 20 16:26:44.077684 2020] [wsgi:error] [pid 38774:tid 139824286275328] [remote ::1:55110] return self.app(environ, start_response) [Fri Nov 20 16:26:44.077687 2020] [wsgi:error] [pid 38774:tid 139824286275328] [remote ::1:55110] File "/usr/lib/python3.6/site-packages/pgadmin4-web/werkzeug/middleware/proxy_fix.py", line 228, in __call__ [Fri Nov 20 16:26:44.077690 2020] [wsgi:error] [pid 38774:tid 139824286275328] [remote ::1:55110] return self.app(environ, start_response) [Fri Nov 20 16:26:44.077693 2020] [wsgi:error] [pid 38774:tid 139824286275328] [remote ::1:55110] File "/usr/lib/python3.6/site-packages/pgadmin4-web/flask/app.py", line 2295, in wsgi_app [Fri Nov 20 16:26:44.077695 2020] [wsgi:error] [pid 38774:tid 139824286275328] [remote ::1:55110] response = self.handle_exception(e) [Fri Nov 20 16:26:44.077698 2020] [wsgi:error] [pid 38774:tid 139824286275328] [remote ::1:55110] File "/usr/lib/python3.6/site-packages/pgadmin4-web/flask/app.py", line 1741, in handle_exception [Fri Nov 20 16:26:44.077700 2020] [wsgi:error] [pid 38774:tid 139824286275328] [remote ::1:55110] reraise(exc_type, exc_value, tb) [Fri Nov 20 16:26:44.077703 2020] [wsgi:error] [pid 38774:tid 139824286275328] [remote ::1:55110] File "/usr/lib/python3.6/site-packages/pgadmin4-web/flask/_compat.py", line 35, in reraise [Fri Nov 20 16:26:44.077706 2020] [wsgi:error] [pid 38774:tid 139824286275328] [remote ::1:55110] raise value [Fri Nov 20 16:26:44.077709 2020] [wsgi:error] [pid 38774:tid 139824286275328] [remote ::1:55110] File "/usr/lib/python3.6/site-packages/pgadmin4-web/flask/app.py", line 2292, in wsgi_app [Fri Nov 20 16:26:44.077711 2020] [wsgi:error] [pid 38774:tid 139824286275328] [remote ::1:55110] response = self.full_dispatch_request() [Fri Nov 20 16:26:44.077714 2020] [wsgi:error] [pid 38774:tid 139824286275328] [remote ::1:55110] File "/usr/lib/python3.6/site-packages/pgadmin4-web/flask/app.py", line 1808, in full_dispatch_request [Fri Nov 20 16:26:44.077716 2020] [wsgi:error] [pid 38774:tid 139824286275328] [remote ::1:55110] self.try_trigger_before_first_request_functions() [Fri Nov 20 16:26:44.077719 2020] [wsgi:error] [pid 38774:tid 139824286275328] [remote ::1:55110] File "/usr/lib/python3.6/site-packages/pgadmin4-web/flask/app.py", line 1855, in try_trigger_before_first_request_functions [Fri Nov 20 16:26:44.077721 2020] [wsgi:error] [pid 38774:tid 139824286275328] [remote ::1:55110] func() [Fri Nov 20 16:26:44.077724 2020] [wsgi:error] [pid 38774:tid 139824286275328] [remote ::1:55110] File "/usr/lib/python3.6/site-packages/pgadmin4-web/pgadmin/utils/__init__.py", line 48, in create_module_preference [Fri Nov 20 16:26:44.077727 2020] [wsgi:error] [pid 38774:tid 139824286275328] [remote ::1:55110] self.register_preferences() [Fri Nov 20 16:26:44.077730 2020] [wsgi:error] [pid 38774:tid 139824286275328] [remote ::1:55110] File "/usr/lib/python3.6/site-packages/pgadmin4-web/pgadmin/browser/__init__.py", line 272, in register_preferences [Fri Nov 20 16:26:44.077732 2020] [wsgi:error] [pid 38774:tid 139824286275328] [remote ::1:55110] register_browser_preferences(self) [Fri Nov 20 16:26:44.077735 2020] [wsgi:error] [pid 38774:tid 139824286275328] [remote ::1:55110] File "/usr/lib/python3.6/site-packages/pgadmin4-web/pgadmin/browser/register_browser_preferences.py", line 461, in register_browser_preferences [Fri Nov 20 16:26:44.077741 2020] [wsgi:error] [pid 38774:tid 139824286275328] [remote ::1:55110] 'Supported placeholders are %DATABASE%, %USERNAME%, and %SERVER%. ' [Fri Nov 20 16:26:44.077745 2020] [wsgi:error] [pid 38774:tid 139824286275328] [remote ::1:55110] File "/usr/lib/python3.6/site-packages/pgadmin4-web/flask_babelex/__init__.py", line 623, in gettext [Fri Nov 20 16:26:44.077747 2020] [wsgi:error] [pid 38774:tid 139824286275328] [remote ::1:55110] return get_domain().gettext(*args, **kwargs) [Fri Nov 20 16:26:44.077750 2020] [wsgi:error] [pid 38774:tid 139824286275328] [remote ::1:55110] File "/usr/lib/python3.6/site-packages/pgadmin4-web/flask_babelex/__init__.py", line 534, in gettext [Fri Nov 20 16:26:44.077753 2020] [wsgi:error] [pid 38774:tid 139824286275328] [remote ::1:55110] return t.ugettext(string) % variables [Fri Nov 20 16:26:44.077765 2020]* [wsgi:error] [pid 38774:tid 139824286275328] [remote ::1:55110] ValueError: unsupported format character 'D' (0x44) at index 28* Regards Rafal
