I am currently using jupyter notebook to run my python code for my project and trying to monitor variables. I have installed the Nbextensions with Variable Inspector activated, however I cannot see any variable values in the Variable Inspector pop-up window and I saw an error message in the JS console of the webpage mentioned in some solutions I found in Google. The error message is as below,

your textkernel.js:1010 Couldn't process kernel message SyntaxError: "undefined" is not valid JSON
at JSON.parse (<anonymous>)
at html_table (main.js?v=20240426151306:130:24)
at code_exec_callback (main.js?v=20240426151306:168:38)
at Kernel._handle_output_message (kernel.js:1199:1)
at i (jquery.min.js:2:1)
at Kernel._handle_iopub_message (kernel.js:1239:1)
at Kernel._finish_ws_message (kernel.js:1018:1)
at kernel.js:1009:1

Unlucky those solutions are for other issues and just mentioned this error by the way. I can see the extension button and pop-up window with nothing as the following figure,
Variable Inspector Pop-up window

Does anyone know how to handle this issue? I am kind of newbie to Jupyter Notebook, and any help will be highly appreciated!

I have no idea what is going on with this kernel error message and hopefully someone met this before and know how to resolve.