You are attempting to compile an outdated version of Marlin with a new version of PlatformIO (5.x) which are incompatible with each other.
It is recommended that you download the latest Marlin firmware and use your current config files. Else, you must downgrade PlatformIO.
Duplicate of Build Marlin 2.0 faied due to the 'framework-arduino-lpc176x @ 0.1.3'.