GUI App installation failed or showing blank screen.
Sometimes users may have problems installing and launching the SFDMU GUI App, because the Electron platform fails to install and run correctly on these local systems.
Basically, the problem is that sorts of error messages appear during installation, or even if the installation is succeeded, user sees only a blank window when attempts to run the App.
For Windows OS, the solution could be fixing of broken or missing Windows Build Tools installation:
delete SFDMU GUI app folder
install windows-build-tools with "npm install --global windows-build-tools"
install again electron globally with "yarn global add electron"
clone again the repository of the SFDMU GUI App
For MacOS unfortunately, for the current moment we was not able to get working solution for this issue.
Also refer this issue: