FluentValidation has been updated 11 times. AddMvc() probably changed 100's of times since Feb.

[Gaelmart]

This line no longer working.

services.AddMvc().AddFluentValidation(fv => fv.RegisterValidatorsFromAssemblyContaining());

'IMvcBuilder' does not contain a definition for 'AddFluentValidation' and no extension method 'AddFluentValidation' accepting a first argument of type 'IMvcBuilder'