"Error: No backend found in registry" when trying to load in Web Worker.

[ScottDellinger]

I'm still trying to mitigate the "warm up" time that locks the browser interface by loading it in a Web Worker. I've gotten it fairly far but have bumped into an error.

"Error: No backend found in registry". This happens when attempting to load the libraries. It appears both attempts to register a backend fail.

Here's from my console (Firefox):

Error: WebGL warning: Exceeded 16 live WebGL contexts for this principal, losing the least recently used one. tf-core.esm.js:17:45101
Registration of backend webgl failed face-api.js:23:50055
e@http://192.168.0.15/Scripts/face-api.js:23:212026
@http://192.168.0.15/Scripts/face-api.js:23:248669
Environment</e.prototype.registerBackend@http://192.168.0.15/Scripts/face-api.js:23:49917
@http://192.168.0.15/Scripts/face-api.js:23:248623
@http://192.168.0.15/Scripts/face-api.js:4:6
@http://192.168.0.15/Scripts/face-api.js:1:2
@http://192.168.0.15/Scripts/v2/FacialComparison/Worker.js:3:1
face-api.js:23:50108
Registration of backend cpu failed face-api.js:23:50055
e@http://192.168.0.15/Scripts/face-api.js:23:315878
@http://192.168.0.15/Scripts/face-api.js:23:353885
Environment</e.prototype.registerBackend@http://192.168.0.15/Scripts/face-api.js:23:49917
@http://192.168.0.15/Scripts/face-api.js:23:353841
@http://192.168.0.15/Scripts/face-api.js:4:6
@http://192.168.0.15/Scripts/face-api.js:1:2
@http://192.168.0.15/Scripts/v2/FacialComparison/Worker.js:3:1
Error: No backend found in registry.

And here's the code from my Web Worker:

let window = self;
importScripts('/Scripts/v2/FacialComparison/setImmediate.js');
importScripts('/Scripts/face-api.js');
(function () {
    send = function (e) {
        // Send something to the main thread
        postMessage(e);
        // Close the worker gracefully, letting it clean up 
        // after itself
        self.close();
    };

    LoadLibraries();
})();

async function LoadLibraries() {
    // load FaceAPI libraries
    try {
        console.log("Loading libraries...");
        await faceapi.loadTinyFaceDetectorModel('/Content/FaceAPIModels');
        await faceapi.loadFaceLandmarkModel('/Content/FaceAPIModels');
        await faceapi.loadFaceRecognitionModel('/Content/FaceAPIModels');
        console.log("Libraries loaded.");
    }
    catch (ex) {
        console.log(ex);
    }
}

Any ideas or suggestions?