Routes tab does not show any existing route

**Describe the bug**
Ember inspector does not show any existing route on 'Routes' page.

**To Reproduce**
Steps to reproduce the behavior:
1. Go to 'Ember-inspector'
2. Click on 'Routes'
3. See error

**Expected behavior**
The list of all existing routes.

**Screenshots**

**Environment**
Browser: Google Chrome Version 96.0.4664.55 (Official Build) (x86_64).
Ember-cli: 3.27.0.
Node: 14.17.5.
Os: darwin x64.
Ember-inspecor:
- version 4.5.3;
- Allow access to file URLs - true;
- Site access - on all sites.

**Additional context**
The problem appeared more then month ago.
An error from console:
```
VM173:91 Ember Inspector has errored.
This is likely a bug in the inspector itself.
You can report bugs at https://github.com/emberjs/ember-inspector.
Error message: decorator is not a function
Stack trace: TypeError: decorator is not a function
at https://localhost:4200/assets/ember-app.js:65354:412
at Array.reduce ()
at _applyDecoratedDescriptor (https://localhost:4200/assets/ember-app.js:65354:369)
at Module.callback (https://localhost:4200/assets/ember-app.js:65382:37)
at Module.exports (https://localhost:4200/assets/vendor.js:118:32)
at requireModule (https://localhost:4200/assets/vendor.js:39:18)
at Class._extractDefaultExport (https://localhost:4200/assets/vendor.js:227856:20)
at Class.resolveOther (https://localhost:4200/assets/vendor.js:227540:32)
at Class.resolve (https://localhost:4200/assets/vendor.js:227598:25)
at _resolve (https://localhost:4200/assets/vendor.js:19951:36)
```