pgadmin4 cannot be started, how to fix it?

[The pgAdmin 4 server could not be contacted:  Fatal Erroe][1]


  [1]: https://i.stack.imgur.com/XZk57.png

pgAdmin Runtime Environment
--------------------------------------------------------
Python Path: "C:\Program Files\PostgreSQL\13\pgAdmin 4\python\python.exe"
Runtime Config File: "C:\Users\haha\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\haha\AppData\Roaming - CHROME_CRASHPAD_PIPE_NAME: \.\pipe\crashpad_2864_HVAALLTNGAOWVHCO - CHROME_RESTART: NW.js|哎呀！NW.js 崩溃了。要立即重新启动吗？|LEFT_TO_RIGHT - CLASSPATH: C:\Program Files\Eclipse Foundation\jdk-11.0.12.7-hotspot\jre\lib\ext - CommonProgramFiles: C:\Program Files\Common Files - CommonProgramFiles(x86): C:\Program Files (x86)\Common Files - CommonProgramW6432: C:\Program Files\Common Files - COMPUTERNAME: HAHA-PC - ComSpec: C:\Windows\system32\cmd.exe - FP_NO_HOST_CHECK: NO - HOMEDRIVE: C: - HOMEPATH: \Users\haha - JAVA_HOME: C:\Program Files\Eclipse Foundation\jdk-11.0.12.7-hotspot
- LOCALAPPDATA: C:\Users\haha\AppData\Local - LOGONSERVER: \HAHA-PC - NUMBER_OF_PROCESSORS: 1 - OS: Windows_NT - Path: C:\Program Files\Eclipse Foundation\jdk-11.0.12.7-hotspot\bin;C:\Windows\system32;C:\Windows;C:\Windows\System32\Wbem;C:\Windows\System32\WindowsPowerShell\v1.0
- PATHEXT: .COM;.EXE;.BAT;.CMD;.VBS;.VBE;.JS;.JSE;.WSF;.WSH;.MSC - PGADMIN_INT_KEY: bfe01206-8bc4-4bd4-9293-472dd90ae0ab - PGADMIN_INT_PORT: 49163 - PGADMIN_SERVER_MODE: OFF - PROCESSOR_ARCHITECTURE: AMD64 - PROCESSOR_IDENTIFIER: Intel64 Family 6 Model 158 Stepping 10, GenuineIntel - PROCESSOR_LEVEL: 6 - PROCESSOR_REVISION: 9e0a - ProgramData: C:\ProgramData - ProgramFiles: C:\Program Files - ProgramFiles(x86): C:\Program Files (x86) - ProgramW6432: C:\Program Files - PSModulePath: C:\Windows\system32\WindowsPowerShell\v1.0\Modules
- PUBLIC: C:\Users\Public - SESSIONNAME: Console - SystemDrive: C: - SystemRoot: C:\Windows - TEMP: C:\Users\haha\AppData\Local\Temp - TMP: C:\Users\haha\AppData\Local\Temp - USERDOMAIN: haha-PC - USERNAME: haha - USERPROFILE: C:\Users\haha - windir: C:\Windows - windows_tracing_flags: 3 - windows_tracing_logfile: C:\BVTBin\Tests\installpackage\csilogfile.log --------------------------------------------------------

Traceback (most recent call last):
  File "C:\Program Files\PostgreSQL\13\pgAdmin 4\web\pgAdmin4.py", line 39, in <module>
    import config
  File "C:\Program Files\PostgreSQL\13\pgAdmin 4\web\config.py", line 25, in <module>
    from pgadmin.utils import env, IS_WIN, fs_short_path
  File "C:\Program Files\PostgreSQL\13\pgAdmin 4\web\pgadmin\__init__.py", line 23, in <module>
    from flask import Flask, abort, request, current_app, session, url_for
  File "C:\Program Files\PostgreSQL\13\pgAdmin 4\python\lib\site-packages\flask\__init__.py", line 14, in <module>
    from jinja2 import escape
  File "C:\Program Files\PostgreSQL\13\pgAdmin 4\python\lib\site-packages\jinja2\__init__.py", line 12, in <module>
    from .environment import Environment
  File "C:\Program Files\PostgreSQL\13\pgAdmin 4\python\lib\site-packages\jinja2\environment.py", line 46, in

from .lexer import get_lexer File "C:\Program Files\PostgreSQL\13\pgAdmin 4\python\lib\site-packages\jinja2\lexer.py", line 46, in compile("f\xf6\xf6", "", "eval") ImportError: DLL load failed while importing unicodedata: ��������