Installed PostgreSQL and cannot get the pgAdmin to open

Question

This is the error I get when I try to open pgAdmin 4. I installed the PostgresSQL 13 which is latest. I did the HKEY fix, cleared temp folders under AppData and ran as admin and nothing. I need to create a database and table. How do I do that if I can't even open pgAdmin.
New to this.

pgAdmin Runtime Environment

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Python Path: "C:\Program Files\PostgreSQL\13\pgAdmin 4\python\python.exe"
Runtime Config File: "C:\Users[user]\AppData\Roaming\pgadmin\runtime_config.json"
pgAdmin Config File: "C:\Program Files\PostgreSQL\13\pgAdmin 4\web\config.py"
Webapp Path: "C:\Program Files\PostgreSQL\13\pgAdmin 4\web\pgAdmin4.py"
pgAdmin Command: "C:\Program Files\PostgreSQL\13\pgAdmin 4\python\python.exe -s C:\Program Files\PostgreSQL\13\pgAdmin 4\web\pgAdmin4.py"

Environment:
   • ALLUSERSPROFILE: C:\ProgramData
   • APPDATA: C:\Users[user]\AppData\Roaming
   • CHROME_CRASHPAD_PIPE_NAME: \.\pipe\crashpad_10156_OYIAWLFFYJSPWPGP
   • CHROME_RESTART: NW.js|Whoa! NW.js has crashed. Relaunch now?|LEFT_TO_RIGHT
   • CLIENTNAME: DEVWS030
   • CommonProgramFiles: C:\Program Files\Common Files
   • CommonProgramFiles(x86): C:\Program Files (x86)\Common Files
   • CommonProgramW6432: C:\Program Files\Common Files
   • COMPUTERNAME: VA-SCRD-TUAW02
   • ComSpec: C:\Windows\system32\cmd.exe
   • DriverData: C:\Windows\System32\Drivers\DriverData
   • HOMEDRIVE: C:
   • HOMEPATH: \Users[user]
   • LOCALAPPDATA: C:\Users[user]\AppData\Local
   • LOGONSERVER: \VA-COLO-DC1
   • NUMBER_OF_PROCESSORS: 2
   • OS: Windows_NT
   • Path: C:\Program Files\Common Files\Oracle\Java\javapath;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0;C:\Windows\System32\OpenSSH;C:\Users[user]\AppData\Local\Microsoft\WindowsApps;
   • PATHEXT: .COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC
   • PGADMIN_INT_KEY: 6faa2add-9f1c-4745-acde-7cf728e0b4b6
   • PGADMIN_INT_PORT: 58801
   • PGADMIN_SERVER_MODE: OFF
   • PROCESSOR_ARCHITECTURE: AMD64
   • PROCESSOR_IDENTIFIER: Intel64 Family 6 Model 45 Stepping 7, GenuineIntel
   • PROCESSOR_LEVEL: 6
   • PROCESSOR_REVISION: 2d07
   • 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
   • SESSIONNAME: RDP-Tcp#1
   • SystemDrive: C:
   • SystemRoot: C:\Windows
   • TEMP: C:\Users[user]\AppData\Local\Temp\2
   • TMP: C:\Users[user]\AppData\Local\Temp\2
   • USERDNSDOMAIN: xx
   • USERDOMAIN: xx
   • USERDOMAIN_ROAMINGPROFILE: xx
   • USERNAME: reena.ponnengada
   • USERPROFILE: C:\Users\reena.ponnengada
   • windir: C:\Windows

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Traceback (most recent call last):
  File "C:\Program Files\PostgreSQL\13\pgAdmin 4\web\pgAdmin4.py", line 98, in
    app = create_app()
  File "C:\Program Files\PostgreSQL\13\pgAdmin 4\web\pgadmin_init_.py", line 347, in create_app
    if not os.path.exists(SQLITE_PATH) or get_version() == -1:
  File "C:\Program Files\PostgreSQL\13\pgAdmin 4\web\pgadmin\setup\db_version.py", line 19, in get_version
    return version.value
AttributeError: 'NoneType' object has no attribute 'value'

Answer 1

Sometimes, it happens because the pgAdmin 4 port number is used by another application or service on your PC. You can see a configure button below the error message.

Just click the configure button, and it will open a window that shows the option to change your port number.

Enter a random port number and hit save. If the number is already in use, it will show an error. Otherwise, it will save.

Finally, restart pgAdmin 4. It worked for me.

Answer 2

This error typically occurs after updates of either PostgreSQL or PgAdmin. What worked for me was deleting the folder C:\Users\username\AppData\Roaming\pgadmin. Then re-install pgAdmin and it will work.