"safari-web-extension-converter", not a developer tool or in PATH

I am on BigSur beta, safari 14 and xcode 12 beta 2.

When i run the command:
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xcrun safari-web-extension-converter /path/to/my/extension


I get this error:
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xcrun: error: unable to find utility "safari-web-extension-converter", not a developer tool or in PATH

You need to use xcode-select to pick the Xcode 12 beta.
You can run it directly from the Xcode folder. Just run something like this:
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xcrun "/Users/juraj/Downloads/Xcode-beta 2.app/Contents/Developer/usr/bin/safari-web-extension-converter" /your_ext_path

(I have no idea why my Xcode is installed in Downloads folder... I'm new to Mac environment)
I am on Catalina and have XCode 12 beta 6 and Safari Technology Preview installed but am getting the following :-

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% sudo xcode-select --switch /Applications/Xcode-beta.app 
Password:

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% xcrun safari-web-extension-converter /Users/aarongray/Desktop/DevelopingASafariWebExtension
safari-web-extension-converter requires at least Safari 14.0 to run.
Unable to parse manifest.json at file:///Users/aarongray/Desktop/DevelopingASafariWebExtension


I have set the Safari Technology Preview as the defualt browser but that did not help.

Created as new topic :- https://developer.apple.com/forums/thread/660279
"safari-web-extension-converter", not a developer tool or in PATH
 
 
Q