Local variable 'debugger_version' referenced before assignment

Hello:
After enabling en file postgresql.conf shared_preload_libraries = '$
libdir/plugin_debugger.dll'
and installing the pldbgapi extension.
I try to debug a created function and pgadmin4 displays the following error.

Local variable 'debugger_version' referenced before assignment.

This variable is not in my function, what is the error.

PostgreSQL 12.2, compiled by Visual C++ build 1914, 64-bit (Windows 2019)
PgAdmin 4.23

The pgadmin4 log says:

---------------------------------
2020-08-04 18:11:33,826: ERROR flask.app: Failed to execute query
(execute_scalar) for the server #2 - CONN:9214613 (Query-id: 1047347):
Error Message:ERROR: no existe la funci├│n pldbg_get_proxy_info() LINE
1: SELECT proxyapiver FROM pldbg_get_proxy_info();
^
HINT: Ninguna funci├│n coincide en el nombre y tipos de argumentos.
Puede ser necesario agregar conversión explícita de tipos.

2020-08-04 18:11:33,827: ERROR flask.app: local variable
'debugger_version' referenced before assignment
Traceback (most recent call last):
File "C:/Program Files/PostgreSQL/12/pgAdmin 4/venv/Lib/site-
packages\flask\app.py", line 1813, in full_dispatch_request
rv = self.dispatch_request()
File "C:/Program Files/PostgreSQL/12/pgAdmin 4/venv/Lib/site-
packages\flask\app.py", line 1799, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "C:/Program Files/PostgreSQL/12/pgAdmin 4/venv/Lib/site-
packages\flask_login\utils.py", line 261, in decorated_view
return func(*args, **kwargs)
File "C:\Program Files\PostgreSQL\12\pgAdmin
4\web\pgadmin\tools\debugger\__init__.py", line 747, in initialize_target
current_app.logger.debug("Debugger version is: %d", debugger_version)
UnboundLocalError: local variable 'debugger_version' referenced before
assignment
---------------------------------

I found the problem. If the scheme is "pulic" it works correctly, with
another scheme the error occurs.
Why can't I use another scheme?
Note that SELECT proxyapiver FROM pldbg_get_proxy_info ();
It is not placing the schema correctly where I am working, in my case "dba"
And now what do I do?