Development tools for Zephyr on STM32Workbench for Zephyr: VS Code extension to set up, build, flash and debug Zephyr applications on STM32.Devicetree manager: browse, edit and visualize Zephyr devicetree, STM32CubeMX-like for Zephyr.
I think your problem is related to a misdefinition of the board.
@see: properties > C/C++ Build > Settings > Target
then fix the Board combobox value; select STM32F429I-DISCO (or STM32F429I-DISC1, it depends on your board)