Thank you for your solution. I faced the same issue, and your fix worked perfectly. I ran flutter clean followed by flutter run, and the app was up and running.
However, the problem is that it only works from the terminal. If I try to run the app using the VS Code GUI (the button in the top right), the same error reappears. Even after running flutter clean and then clicking the debug button, the error still persists.

"Launching lib\main.dart on SM N975F in debug mode...

FAILURE: Build failed with an exception.

* What went wrong:

Execution failed for task ':app:compileFlutterBuildDebug'.

\> Failed to create parent directory 'C:\Users\Mujeeb' when creating directory 'C:\Users\Mujeeb\ Khawaja\Desktop\flutter\ projects\new\ videx\videx\build\app\intermediates\flutter\debug\flutter_assets'

* Try:

\> Run with --stacktrace option to get the stack trace.

\> Run with --info or --debug option to get more log output.

\> Run with --scan to get full insights.

\> Get more help at https://help.gradle.org.

BUILD FAILED in 6s

Error: Gradle task assembleDebug failed with exit code 1"

My directory name in "This PC" is "C:\Users\Mujeeb Khawaja", not 'C:\Users\Mujeeb' and flutter is trying to do "'C:\Users\Mujeeb\ Khawaja\"