Arduino errors compiling

Trying out my new WIO Terminal. I’M using Arduino 1.8.13. added the following to preferences:
https://files.seeedstudio.com/arduino/package_seeeduino_boards_index.json

Selected WIO Terminal from board manager. Get the following error when compiling:

fork/exec /home/pi/.arduino15/packages/Seeeduino/tools/arm-none-eabi-gcc/7-2017q4/bin/arm-none-eabi-g++: no such file or directory
Error compiling for board Seeeduino Wio Terminal.

Any ideas? I’m running on Raspberry Pi 400. No problems compiling for AVR, ESP32 or ESP8266
Thanks
Dan

@Dan_Powell I think your board software is not complete download . you can remove it and download it again.

Thanks for the reply. I’ve already uninstalled and reinstalled.
Twice

I’ll try removing the entire directory.