PgAdmin won't start

Hi,

I cannot run PgAdmin on Windows. It used to work, but stopped seemingly 
without a reason.

The error is "The pgAdmin 4 server could not be contacted". I tried all 
the solutions I found on SO (it seems to be quite a frequent error),

but none helped.

Below is the full message.


--------------------------------------------------------
Python Path: "C:\Users\jiri\AppData\Local\Programs\pgAdmin 
4\v5\python\python.exe"
Runtime Config File: 
"C:\Users\jiri\AppData\Roaming\pgadmin\runtime_config.json"
pgAdmin Config File: "C:\Users\jiri\AppData\Local\Programs\pgAdmin 
4\v5\web\config.py"
Webapp Path: "C:\Users\jiri\AppData\Local\Programs\pgAdmin 
4\v5\web\pgAdmin4.py"
pgAdmin Command: "C:\Users\jiri\AppData\Local\Programs\pgAdmin 
4\v5\python\python.exe -s C:\Users\jiri\AppData\Local\Programs\pgAdmin 
4\v5\web\pgAdmin4.py"
Environment:
   - AFCS_ASPOSE_APP_KEY: 871d7b08f1011a9dbad6540c423143e8
   - AFCS_ASPOSE_APP_SID: c9edffdb-40c1-4d16-bb72-036ffbcb1db9
   - AFCS_ConnectionString: 
Host=p69.project-syndicate.org;Database=project-syndicate;Username=article_converter;Password=Eb%F5x56
   - ALLUSERSPROFILE: C:\ProgramData
   - APPDATA: C:\Users\jiri\AppData\Roaming
   - CHROME_CRASHPAD_PIPE_NAME: \\.\pipe\crashpad_23040_YFVWWAUTZLSUEEOW
   - CHROME_RESTART: NW.js|Whoa! NW.js has crashed. Relaunch 
now?|LEFT_TO_RIGHT
   - CommonProgramFiles: C:\Program Files\Common Files
   - CommonProgramFiles(x86): C:\Program Files (x86)\Common Files
   - CommonProgramW6432: C:\Program Files\Common Files
   - COMPUTERNAME: DESKTOP-G7I32CC
   - ComSpec: C:\WINDOWS\system32\cmd.exe
   - DriverData: C:\Windows\System32\Drivers\DriverData
   - GIT_SSH: C:\Program Files\PuTTY\plink.exe
   - GOPATH: C:\Users\jiri\go
   - HOMEDRIVE: C:
   - HOMEPATH: \Users\jiri
   - LOCALAPPDATA: C:\Users\jiri\AppData\Local
   - LOGONSERVER: \\DESKTOP-G7I32CC
   - NUMBER_OF_PROCESSORS: 8
   - OneDrive: D:\OneDrive - Project Syndicate\OneDrive - The Project 
Syndicate, o.p.s
   - OneDriveCommercial: D:\OneDrive - Project Syndicate\OneDrive - The 
Project Syndicate, o.p.s
   - OS: Windows_NT
   - Path: 

C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;C:\WINDOWS\System32\OpenSSH\;C:\Program

Files\Microsoft SQL Server\130\Tools\Binn\;C:\Program Files\Microsoft 
SQL Server\Client SDK\ODBC\170\Tools\Binn\;C:\Program 
Files\PuTTY\;C:\Program Files\TortoiseSVN\bin;C:\Program Files 
(x86)\Gpg4win\..\GnuPG\bin;C:\Program Files\Git\cmd;C:\Program 
Files\Go\bin;C:\Program Files\dotnet\;C:\Program 

Files\Docker\Docker\resources\bin;C:\ProgramData\DockerDesktop\version-bin;C:\Python27;C:\Users\jiri\AppData\Local\Microsoft\WindowsApps;C:\Users\jiri\AppData\Local\Programs\Microsoft

VS Code\bin;C:\Program 
Files\liquibase;C:\msys64\usr\bin;C:\msys64\mingw64\bin;C:\Users\jiri\go\bin;C:\Users\jiri\.dotnet\tools
   - PATHEXT: .COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC
   - PGADMIN_INT_KEY: 376bd0e7-5ac9-4ebd-ba93-0f3f364faaad
   - PGADMIN_INT_PORT: 49537
   - PGADMIN_SERVER_MODE: OFF
   - PROCESSOR_ARCHITECTURE: AMD64
   - PROCESSOR_IDENTIFIER: AMD64 Family 23 Model 17 Stepping 0, AuthenticAMD
   - PROCESSOR_LEVEL: 23
   - PROCESSOR_REVISION: 1100
   - ProgramData: C:\ProgramData
   - ProgramFiles: C:\Program Files
   - ProgramFiles(x86): C:\Program Files (x86)
   - ProgramW6432: C:\Program Files
   - PSModulePath: C:\Program 
Files\WindowsPowerShell\Modules;C:\WINDOWS\system32\WindowsPowerShell\v1.0\Modules
   - PUBLIC: C:\Users\Public
   - SERINUMB: DA428419
   - SESSIONNAME: Console
   - SVN_SSH: C:\Program Files\PuTTY\plink.exe
   - SystemDrive: C:
   - SystemRoot: C:\WINDOWS
   - TEMP: C:\Users\jiri\AppData\Local\Temp
   - TMP: C:\Users\jiri\AppData\Local\Temp
   - USERDOMAIN: DESKTOP-G7I32CC
   - USERDOMAIN_ROAMINGPROFILE: DESKTOP-G7I32CC
   - USERNAME: jiri
   - USERPROFILE: C:\Users\jiri
   - WBSET: Done
   - windir: C:\WINDOWS
   - WIX: C:\Program Files (x86)\WiX Toolset v3.11\
   - __COMPAT_LAYER: DetectorsAppHealth
--------------------------------------------------------

2021-11-23 14:29:32,026: WARNING    werkzeug:    WebSocket transport not 
available. Install simple-websocket for improved performance.

NOTE: Configuring authentication for DESKTOP mode.
pgAdmin 4 - Application Initialisation
======================================

  * Serving Flask app "pgadmin" (lazy loading)
  * Environment: production
    WARNING: This is a development server. Do not use it in a production 
deployment.
    Use a production WSGI server instead.
  * Debug mode: off

2021-11-23 14:29:32,026: WARNING    werkzeug:    WebSocket transport not 
available. Install simple-websocket for improved performance.