Failed to build models - Umbraco V8.6.1

[SvenGoormans]

All the nested content & MTNP pickers are configured correctly.
After installing the package and re-generating all models. I get following error in models.err file:

`Failed to build models.
Unable to load one or more of the requested types. Retrieve the LoaderExceptions property for more information.

at System.Reflection.RuntimeModule.GetTypes(RuntimeModule module)
at System.Reflection.RuntimeModule.GetTypes()
at System.Reflection.Assembly.GetTypes()
at Our.Umbraco.SuperValueConverters.Helpers.TypeHelper.<>c.b__0_0(Assembly x)
at System.Linq.Enumerable.d__172.MoveNext() at System.Linq.Enumerable.WhereEnumerableIterator1.MoveNext()
at Our.Umbraco.SuperValueConverters.Helpers.TypeHelper.GetType(String typeName, String namespaceName)
at Our.Umbraco.SuperValueConverters.Helpers.TypeHelper.<>c__DisplayClass1_0.b__0(String x)
at System.Linq.Enumerable.WhereSelectArrayIterator2.MoveNext() at System.Linq.Enumerable.WhereEnumerableIterator1.MoveNext()
at System.Linq.Enumerable.Any[TSource](IEnumerable1 source) at Our.Umbraco.SuperValueConverters.ValueConverters.SuperValueConverterBase.GetTypeForAllowedTypes(String[] allowedTypes) at Our.Umbraco.SuperValueConverters.ValueConverters.SuperValueConverterBase.GetPropertyValueType(IPublishedPropertyType propertyType) at Umbraco.Core.Models.PublishedContent.PublishedPropertyType.InitializeLocked() in D:\a\1\s\src\Umbraco.Core\Models\PublishedContent\PublishedPropertyType.cs:line 176 at Umbraco.Core.Models.PublishedContent.PublishedPropertyType.Initialize() in D:\a\1\s\src\Umbraco.Core\Models\PublishedContent\PublishedPropertyType.cs:line 104 at Umbraco.Core.Models.PublishedContent.PublishedPropertyType.get_ModelClrType() in D:\a\1\s\src\Umbraco.Core\Models\PublishedContent\PublishedPropertyType.cs:line 245 at Umbraco.ModelsBuilder.Umbraco.UmbracoServices.GetTypes(PublishedItemType itemType, IContentTypeComposition[] contentTypes) in D:\d\Zbu ModelsBuilder\src\Umbraco.ModelsBuilder\Umbraco\UmbracoServices.cs:line 164 at Umbraco.ModelsBuilder.Umbraco.UmbracoServices.GetAllTypes() in D:\d\Zbu ModelsBuilder\src\Umbraco.ModelsBuilder\Umbraco\UmbracoServices.cs:line 39 at Umbraco.ModelsBuilder.Umbraco.ModelsBuilderBackOfficeController.GenerateModels(UmbracoServices umbracoServices, String modelsDirectory, String bin, String modelsNamespace) in D:\d\Zbu ModelsBuilder\src\Umbraco.ModelsBuilder\Umbraco\ModelsBuilderBackOfficeController.cs:line 121 at Umbraco.ModelsBuilder.Umbraco.ModelsBuilderBackOfficeController.BuildModels() in D:\d\Zbu ModelsBuilder\src\Umbraco.ModelsBuilder\Umbraco\ModelsBuilderBackOfficeController.cs:line 45