Angular application compiled successfully but isn't loaded in the browser, also throwing...

I upgraded my Angular application from Angular 11 to Angular 12, after a lot of work I finally solved all the errors and the application was compiling successfully. But now when I open the local server to take a look at it, it doesn't display anything on the screen . Error Coming in console is below .

util.js:109 Uncaught ReferenceError: process is not defined
at Object.MCLT (util.js:109:1)
at __webpack_require__ (bootstrap:84:1)
at yz4/ (dropdown-menu.component.ts:9:35)
at __webpack_require__ (bootstrap:84:1)
at Dwu+ (environment.ts:16:68)
at __webpack_require__ (bootstrap:84:1)
at Module.ZAI4 (main.js:3680:94)
at __webpack_require__ (bootstrap:84:1)
at Module.zUnb (main.ts:1:1)
at __webpack_require__ (bootstrap:84:1)


Can someone help me out to Load the application on browser.

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