TypeError: Cannot read properties of undefined (reading 'assets')

[Tom-H2oThermo]

Describe the bug
When I run "npm start" I'm getting a number of errors.

To Reproduce
Steps to reproduce the behavior:
run "npm build" and "npm start". At first I was getting about 89 errors with long cryptic error explanations. this page https://stackoverflow.com/questions/64557638/how-to-polyfill-node-core-modules-in-webpack-5 says that this issue happens when your webpack module gets upgraded from V4 to V5, which must have happened when I ran "npm build". That same page said that a solution was to install the node-polyfill-webpack-plugin which I did. Then the number of errors were reduced to 10 relatively simple errors, but I don't know how to fix them.

Expected behavior
I expected the "npm start" to work and open my Excel app/taskpane.

Screenshots or logs/output in Terminal Please see the errors below.
**PS C:\Users\tomte\OneDrive\Documents\GitHub\H2oThermo_App-Development1> npm start

[email protected] prestart
npm run build
[email protected] build
webpack --mode production
C:\Users\tomte\OneDrive\Documents\GitHub\H2oThermo_App-Development1\node_modules\webpack\lib\Compilation.js:4706
if (buildInfo.assets) {
^
TypeError: Cannot read properties of undefined (reading 'assets')
at Compilation.createModuleAssets (C:\Users\tomte\OneDrive\Documents\GitHub\H2oThermo_App-Development1\node_modules\webpack\lib\Compilation.js:4706:18)
at C:\Users\tomte\OneDrive\Documents\GitHub\H2oThermo_App-Development1\node_modules\webpack\lib\Compilation.js:3196:13
at Compilation._runCodeGenerationJobs (C:\Users\tomte\OneDrive\Documents\GitHub\H2oThermo_App-Development1\node_modules\webpack\lib\Compilation.js:3351:11)
at C:\Users\tomte\OneDrive\Documents\GitHub\H2oThermo_App-Development1\node_modules\webpack\lib\Compilation.js:3181:12
at C:\Users\tomte\OneDrive\Documents\GitHub\H2oThermo_App-Development1\node_modules\webpack\lib\Compilation.js:3443:6
at C:\Users\tomte\OneDrive\Documents\GitHub\H2oThermo_App-Development1\node_modules\neo-async\async.js:2818:7
at done (C:\Users\tomte\OneDrive\Documents\GitHub\H2oThermo_App-Development1\node_modules\neo-async\async.js:3522:9)
at C:\Users\tomte\OneDrive\Documents\GitHub\H2oThermo_App-Development1\node_modules\webpack\lib\Compilation.js:3404:8
at C:\Users\tomte\OneDrive\Documents\GitHub\H2oThermo_App-Development1\node_modules\webpack\lib\Compilation.js:3521:5
at C:\Users\tomte\OneDrive\Documents\GitHub\H2oThermo_App-Development1\node_modules\enhanced-resolve\lib\forEachBail.js:39:13

Node.js v18.20.2**

Environment(please complete the following information):

• OS: Microsoft Windows 11 Home
• Version 10.0.22361
• VS Code Version 1.94.2
• Node Version 18.20.2

[hermanwenhe]

Is this project created from a hello world template or from a sample in sample gallery?

[hermanwenhe]

The npm build script won't upgrade the webpack. Have you done the upgrade yourself? After a new project is setup, the only thing you need to do before npm start is npm install.