Error: The PlatformIO task detection didn't contribute a task for the following configuration:

[reddy9698]

I was working on a project and everything was working fine. I suddenly start getting the error out of the blue and on top of this every PlatformIO project I have has the following error :
error: ‘class HardwareSerial’ has no member named ‘println’

I checked similar issues but there is no file named tasks.json.
I did a full clean uninstall and reinstall but still the same error

[zanzythebar]

This might be related to the toolchain breaking. Is your project also generating junk files, and giving you toolchain directory not found errors? This is very common the last two days. There are other threads that already answer this issue - such as this one:

Unable to resolve configuration with compiler path ERROR and generating random files in projects

I had this same issue, nothing fixed it. See this thread I tried vscode on another machine, same thing. However, when i logged out of my account on the other machine, disabled all extensions but the platformio and c++ extensions required by pio - the issue STILL happened. This told me the issue was not my machine, but my extension settings, so I went and checked the c++ extension - it was on the pre-release version. I switched to the release version - problem solved (for now). I am absolutely p…

[reddy9698]

Yeah I already tried that. I tried both the pre-release and the release version. Nothing seems to work.