Build issue

[AlanMThomason]

First off, thanks to everyone who brought this project to the public. It is really amazing. I am trying to set this up for a classroom, and I think this is great path. I have added some blocks to allow adjusting servo speed and set up and read a serial stream on an arbitrary channel. I am running it using

python start.py (where my default python is 3.7.9)

I can successfully build the step ...\blockly>c:\python27\python build.py

But when I try to build the package, I see an error...

C:\SVN_working\ardublockly_at.git\trunk\package\electron>npm run release

@ release C:\SVN_working\ardublockly_at.git\trunk\package\electron
gulp release --env=production

fs.js:45
} = primordials;
^

ReferenceError: primordials is not defined
at fs.js:45:5
at req_ (C:\SVN_working\ardublockly_at.git\trunk\package\electron\node_modules\natives\index.js:143:24)
at Object.req [as require] (C:\SVN_working\ardublockly_at.git\trunk\package\electron\node_modules\natives\index.js:55:10)
at Object. (C:\SVN_working\ardublockly_at.git\trunk\package\electron\node_modules\vinyl-fs\node_modules\graceful-fs\fs.js:1:37)
at Module._compile (internal/modules/cjs/loader.js:1068:30)
at Object.Module._extensions..js (internal/modules/cjs/loader.js:1097:10)
at Module.load (internal/modules/cjs/loader.js:933:32)
at Function.Module._load (internal/modules/cjs/loader.js:774:14)
at Module.require (internal/modules/cjs/loader.js:957:19)
at require (internal/modules/cjs/helpers.js:88:18)
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! @ release: gulp release --env=production
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the @ release script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR! C:\Users\alanm\AppData\Roaming\npm-cache_logs\2021-07-07T23_55_49_422Z-debug.log

My npm version is
C:\SVN_working\ardublockly_at.git\trunk\ardublockly>npm --v
6.14.13

Can anyone see what I am doing wrong (or is there something other information needed). Thanks in advance.