Umbraco Models Builder suddenly not working

Questions
1

Just without any reason the models builder custom tool isn’t working anymore. Nothing has changed to Umbraco configuration or binaries.

I am using this extension in Visual Studio:

Settings:

Umbraco.ModelsBuilder.Enable = true; Umbraco.ModelsBuilder.ModelsMode
= Nothing Umbraco.ModelsBuilder.EnableApi = true

I get the following error in my output window, I don’t know what can cause this issue.

UmbracoModelsBuilder: Starting v8.0.5 12/20/2021 11:58:00 AM.
UmbracoModelsBuilder: UmbracoModelsBuilder failed to generate code: Exception: Response status code does not indicate success (InternalServerError)

Boot failed: Umbraco cannot run. See Umbraco's log file for more details.

-> Umbraco.Core.Exceptions.BootFailedException: Boot failed.

-> System.TimeoutException: Cannot acquire MainDom
  at Umbraco.Core.Runtime.MainDom.Acquire() in D:\a\1\s\src\Umbraco.Core\Runtime\MainDom.cs:line 172
  at Umbraco.Core.Runtime.MainDom.<get_IsMainDom>b__16_0() in D:\a\1\s\src\Umbraco.Core\Runtime\MainDom.cs:line 204
  at System.Threading.LazyInitializer.EnsureInitializedCore[T](T& target, Boolean& initialized, Object& syncLock, Func`1 valueFactory)
  at Umbraco.Core.Runtime.MainDom.get_IsMainDom() in D:\a\1\s\src\Umbraco.Core\Runtime\MainDom.cs:line 204
  at Umbraco.Core.Runtime.CoreRuntime.AcquireMainDom(IMainDom mainDom) in D:\a\1\s\src\Umbraco.Core\Runtime\CoreRuntime.cs:line 348
  at Umbraco.Core.Runtime.CoreRuntime.Boot(IRegister register, DisposableTimer timer) in D:\a\1\s\src\Umbraco.Core\Runtime\CoreRuntime.cs:line 173
This is a companion discussion topic for the original entry at https://our.umbraco.com/forum/107868-umbraco-models-builder-suddenly-not-working