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Delete the C++ Intellisense extension by austin, it is known to conflict with PlatformIO. Restart VSCode afterwards and do a Ctrl+Shift+P → Rebuild IntelliSense.

I did all steps . :frowning:

Yeah okay I have no idea what’s going on there.

Try to file an issue at Issues · platformio/platformio-vscode-ide · GitHub

Thank you for your time :slight_smile:
I can work OK, but I can’t use all advantages of the IDE.
Maybe I have to reinstall it :slight_smile:
Thank you again

Just for your info how it looks, when I copy whole project to the C drive :slight_smile:

SOLVED: Ensure Intelli Sense Engine is enabled for Microsoft C/C++ extension, ie set it to default as in the attached image and it should work