Entity Framework configuration error?

Question

Entity Framework

An error pops up in an ASP.NET application, in this project:
EntityHeart - context with models.
entity1 - ASP.NET startup project
Error 1. As is!
The error occurs when querying the database.

// метод GetAll() примерно такой
return _entityContext.SomeTable;

GetAll() - successfully returns IQueryable, and after calling ToList(), accordingly, an error occurs
Error 2. (after adding the connectionStrings tag to the Web.config ) Error 3. (after adding the entityFramework and providers tags to the Web.config ) Web.config itself (in comments 1 and 2 - this is what I added): I also want to note that the project with Entity has App.config and packages.config What and where do I need to add?





And is it possible to make sure that changes are made only to one project with Entity, and when creating new projects, nothing needs to be changed in them?