"The call is ambiguous between" error at AddBackOffice() in Startup.cs after updating to Umbraco 14

Questions
1

Hi,

After updating to Umbraco 14, I’m getting the following error:

The call is ambiguous between the following methods or properties:

‘Umbraco.Extensions.UmbracoBuilderExtensions.AddBackOffice(Umbraco.Cms.Core.DependencyInjection.IUmbracoBuilder, System.Action<Microsoft.Extensions.DependencyInjection.IMvcBuilder>?)’

and

‘Umbraco.Extensions.UmbracoBuilderExtensions.AddBackOffice(Umbraco.Cms.Core.DependencyInjection.IUmbracoBuilder, System.Action<Microsoft.Extensions.DependencyInjection.IMvcBuilder>?)’

As you can see here, the 2 are exactly the same:

enter image description here
enter image description here876×143 17.3 KB

enter image description here
enter image description here854×132 16.6 KB

Anyone have any ideas what the issue could be?

This is a companion discussion topic for the original entry at https://our.umbraco.com/forum/114237-the-call-is-ambiguous-between-error-at-addbackoffice-in-startupcs-after-updating-to-umbraco-14