I also got the same error, while trying to run the “grunt” command to load the ODK-X Application Designer.
Till the issue get resolved to access the app-designer on latest google chrome version, alternately installing Safari browser 5.1.7, the last stable version released by Apple for Windows, will help.
I have downloaded and installed Safari browser from this website: Safari Browser for Windows Download Free - 5.1.7 | TechSpot
It worked for me, but partially. Screenshot attached.
