So i was following a youtube tutorial and needed to set my virtual environment for jupyter in my command prompt and when i write jupyter lab my command prompt stops responding and doesn’t allow me to write anything because the next line doesn’t work.
Even without setting the environment it does the same thing.
I installed the latest version of anaconda today after witnessing the same issue prior.

so when i type jupyter lab i get the following :-

jupyter lab
……

To access the server, open this file in a browser:
    file:///C:/Users/ACER/AppData/Roaming/jupyter/runtime/jpserver-13908-open.html
Or copy and paste one of these URLs:
    http://localhost:8888/lab?token=1a303eff345dbbeff2f77d03baa6184ba1fd8e066123d66f
    http://127.0.0.1:8888/lab?token=1a303eff345dbbeff2f77d03baa6184ba1fd8e066123d66f

[I 2024-08-04 16:17:24.382 ServerApp] Skipped non-installed server(s): bash-language-server, dockerfile-language-server-nodejs, javascript-typescript-langserver, jedi-language-server, julia-language-server, pyright, python-language-server, r-languageserver, sql-language-server, texlab, typescript-language-server, unified-language-server, vscode-css-languageserver-bin, vscode-html-languageserver-bin, vscode-json-languageserver-bin, yaml-language-server
0.01s – Debugger warning: It seems that frozen modules are being used, which may
0.00s – make the debugger miss breakpoints. Please pass -Xfrozen_modules=off
0.00s – to python to disable frozen modules.
0.00s – Note: Debugging will proceed. Set PYDEVD_DISABLE_FILE_VALIDATION=1 to disable this validation.
[W 2024-08-04 16:17:31.348 LabApp] Could not determine jupyterlab build status without nodejs
[W 2024-08-04 16:17:32.163 ServerApp] wrote error: ‘Forbidden’
Traceback (most recent call last):
File “C:UsersACERanaconda3Libsite-packagestornadoweb.py”, line 1790, in _execute
result = await result
^^^^^^^^^^^^

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:UsersACERanaconda3Libsite-packagestornadoweb.py", line 1790, in _execute
    result = await result
             ^^^^^^^^^^^^
  File "C:UsersACERanaconda3Libsite-packagesjupyter_serverauthdecorator.py", line 73, in inner
    return await out

KeyError: 'last_activity'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "C:UsersACERanaconda3Libsite-packagestornadoweb.py", line 1790, in _execute
    result = await result
             ^^^^^^^^^^^^
  File "C:UsersACERanaconda3Libsite-packagesjupyter_serverauthdecorator.py", line 73, in inner
    return await out
           ^^^^^^^^^
  File "C:UsersACERanaconda3Libsite-packagesjupyter_serverserviceskernelshandlers.py", line 41, in get
    kernels = await ensure_async(km.list_kernels())
                                 ^^^^^^^^^^^^^^^^^
  File "C:UsersACERanaconda3Libsite-packagesjupyter_serverserviceskernelskernelmanager.py", line 521, in list_kernels
    model = self.kernel_model(kernel_id)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:UsersACERanaconda3Libsite-packagesjupyter_serverserviceskernelskernelmanager.py", line 507, in kernel_model
    "last_activity": isoformat(kernel.last_activity),
                               ^^^^^^^^^^^^^^^^^^^^
  File "C:UsersACERanaconda3Libsite-packagestraitletstraitlets.py", line 687, in __get__
    return t.cast(G, self.get(obj, cls))  # the G should encode the Optional
                     ^^^^^^^^^^^^^^^^^^
  File "C:UsersACERanaconda3Libsite-packagestraitletstraitlets.py", line 649, in get
    value = self._validate(obj, default)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:UsersACERanaconda3Libsite-packagestraitletstraitlets.py", line 722, in _validate
    value = self.validate(obj, value)
            ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:UsersACERanaconda3Libsite-packagestraitletstraitlets.py", line 2311, in validate
    self.error(obj, value)
  File "C:UsersACERanaconda3Libsite-packagestraitletstraitlets.py", line 831, in error
    raise TraitError(e)
traitlets.traitlets.TraitError: The 'last_activity' trait of a ServerKernelManager instance expected a datetime, not the NoneType None.

[E 2024-08-04 16:17:40.077 ServerApp] {
“Host”: “localhost:8888”,
“Accept”: “/“,
“Referer”: “http://localhost:8888/lab/tree/Getting%20Started.ipynb?”,
“User-Agent”: “Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/127.0.0.0 Safari/537.36 Edg/127.0.0.0”
}
[E 2024-08-04 16:17:40.079 ServerApp] 500 GET /api/kernels?1722777459980 (b55017e6aace4da0b117d7d7d9fbc16e@::1) 34.91ms referer=http://localhost:8888/lab/tree/Getting%20Started.ipynb?
[I 2024-08-04 16:17:40.090 ServerApp] Kernel started: cd98396c-a478-4f2d-8930-49b1518cabf0
0.01s – Debugger warning: It seems that frozen modules are being used, which may
0.00s – make the debugger miss breakpoints. Please pass -Xfrozen_modules=off
0.00s – to python to disable frozen modules.
0.00s – Note: Debugging will proceed. Set PYDEVD_DISABLE_FILE_VALIDATION=1 to disable this validation.
[I 2024-08-04 16:17:43.919 ServerApp] Connecting to kernel cd98396c-a478-4f2d-8930-49b1518cabf0.
[I 2024-08-04 16:17:43.940 ServerApp] Connecting to kernel cd98396c-a478-4f2d-8930-49b1518cabf0.
[I 2024-08-04 16:17:43.982 ServerApp] Connecting to kernel cd98396c-a478-4f2d-8930-49b1518cabf0.
[I 2024-08-04 16:19:40.125 ServerApp] Saving file at /Getting Started.ipynb
[W 2024-08-04 16:19:40.128 ServerApp] Notebook Getting Started.ipynb is not trusted

and my command prompt stops even though jupyter opened but this makes it harder to set a venv.

I have uninstalled and installed anaconda , i have removed parts of this error because stackoverflow wont let me ask my first ever question on this platform and instead says it ‘appears’ spam. Well looks like someone just had a Type 1 error.