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.
Hello I got the same problem (error 127). You should try to change the external builder to internal builder in project properties (look for C/C++ Build tab).