Uncaught exception after XML upload

[lpereira]

Hi! I've installed this plugin (version 0.4.5) onto my Discourse (3.4.0.beta3-dev) installation. When uploading my MediaWiki export XML generated from a MediaWiki version 1.34, I get no changes in the UI.

When looking at the JS console, I get a few deprecation warnings:

composer.js:874 Deprecation notice: The UppyUploadMixin is deprecated. See discourse/lib/uppy/uppy-upload.js for the new implementation. [deprecation id: discourse.uppy-upload-mixin]
deprecate-shim.js:34 DEPRECATION: [PLUGIN discourse-media-wiki-import] The `uploading` property path was used in the `discourse/plugins/discourse-media-wiki-import/discourse/templates/components/media-wiki-uploader.hbs` template without using `this`. This fallback behavior has been deprecated, all properties must be looked up on `this` when used in the template: {{this.uploading}} [deprecation id: ember-this-fallback.this-property-fallback] See https://meta.discourse.org/t/337276 for more details.
(anonymous) @ deprecate-shim.js:34
deprecate-shim.js:34 DEPRECATION: [PLUGIN discourse-media-wiki-import] The `id` property path was used in the `discourse/plugins/discourse-media-wiki-import/discourse/templates/components/media-wiki-uploader.hbs` template without using `this`. This fallback behavior has been deprecated, all properties must be looked up on `this` when used in the template: {{this.id}} [deprecation id: ember-this-fallback.this-property-fallback] See https://meta.discourse.org/t/337276 for more details.
(anonymous) @ deprecate-shim.js:34
deprecate-shim.js:34 DEPRECATION: [PLUGIN discourse-media-wiki-import] The `uploadedMediaWikiExportDisplayName` property path was used in the `discourse/plugins/discourse-media-wiki-import/discourse/templates/components/media-wiki-uploader.hbs` template without using `this`. This fallback behavior has been deprecated, all properties must be looked up on `this` when used in the template: {{this.uploadedMediaWikiExportDisplayName}} [deprecation id: ember-this-fallback.this-property-fallback] See https://meta.discourse.org/t/337276 for more details.

And then a backtrace:

(anonymous) @ deprecate-shim.js:34
index.js:1384 Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'call')
    at pe._set (index.js:1384:1)
    at pe.set (index.js:1353:1)
    at b (core.js:61:1)
    at Function.create (core.js:401:1)
    at d.create (index.js:385:1)
    at ze.create (index.js:1997:1)
    at Object.evaluate (runtime.js:2676:1)
    at Object.evaluate (runtime.js:1052:1)
    at It.evaluateSyscall (runtime.js:4204:1)
    at It.evaluateInner (runtime.js:4175:1)
    at It.evaluateOuter (runtime.js:4168:1)
    at Wt.next (runtime.js:4999:1)
    at Wt._execute (runtime.js:4986:1)
    at Wt.execute (runtime.js:4979:1)
    at Ut.handleException (runtime.js:4313:1)
    at Vt.handleException (runtime.js:4521:1)
    at Dt.throw (runtime.js:4260:1)
    at $e.evaluate (runtime.js:2088:1)
    at Dt._execute (runtime.js:4247:1)
    at Dt.execute (runtime.js:4232:1)
    at qt.rerender (runtime.js:4547:1)
    at dr.render (index.js:4674:1)
    at index.js:4934:1
    at Nt (runtime.js:4080:1)
    at gr._renderRoots (index.js:4916:1)
    at gr._renderRootsTransaction (index.js:4960:1)
    at gr._revalidate (index.js:4992:1)
    at invoke (backburner.js.js:280:1)
    at d.flush (backburner.js.js:197:1)
    at p.flush (backburner.js.js:358:1)
    at B._end (backburner.js.js:798:1)
    at backburner.js.js:523:1

I'm happy to provide any other information that might be relevant.