Blynk.virtualWrite - 'Blynk' does not name a type

Posting the relevant part of your compiler output (copy/paste the text and use triple backticks again - do not post a screenshot) would be helpful.

Also, you’ve delete all of the board type definitions without un-commenting one of them, so the custom board type will be used. That means your LED and boot button will not work as expected during the provisioning process, and you may have conflicts between the custom board type pins and your sensors.
You should read this for more info…

Pete.