Issue loading entity framework SQL C# WPF project

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SQL

WPF

WinForms

database

CRUD

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Hello all I have a question,
I am using entity framework with a C# WPF project. I am just doing CRUD with EF for a simple project but I am having issues just starting the project up. At first I was having an error saying “The underlying provider failed on open()”. I ended up getting past that error by looking online and doing what it says. Now I am getting the error “See the InnerException for details. —> System.Data.Entity.Core.EntityException: An exception has been raised that is likely due to a transient failure. If you are connecting to a SQL Azure database consider using SqlAzureExecutionStrategy“ I am not using Azure. I am just using a .mdf database in SQL on visual studio 2017.
Here is my code that I am using

public class CRUD
    {
        private EntitiesDB entitiesDb = null;


        public Person GetPersonById(int personId)
        {
            return entitiesDb.People.Find(personId);
        }

        public List<Person> GetAllPeopleList()
        {
            return entitiesDb.People.ToList();
        }

        public void AddPerson(Person person)
        {
            if(person != null)
            {
                entitiesDb.People.Add(person);
                entitiesDb.SaveChanges();
            }            
        }

        public void UpdatePerson(Person person)
        {
            Person getPerson = GetPersonById(person.Id);
            if(getPerson != null)
            {
                getPerson.FirstName = person.FirstName;
                getPerson.LastName = person.LastName;
                getPerson.Age = person.Age;
                getPerson.ProgrammingLanguage = person.ProgrammingLanguage;
                getPerson.DateCreated = person.DateCreated;
                entitiesDb.SaveChanges();
            }
        }

        public void RemovePerson(int personId)
        {
            Person removePerson = entitiesDb.People.Find(personId);
            if(removePerson != null)
            {
                entitiesDb.People.Remove(removePerson);
                entitiesDb.SaveChanges();
            }
        }


        public CRUD()
        {
            entitiesDb = new EntitiesDB();
        }
    }
public partial class MainWindow : Window
    {
        //Make Entity Framework object.
        private CRUD framework;
        private Person person;

        public MainWindow()
        {
            InitializeComponent();
            framework = new CRUD();

            PopulateDataGrid();
        }

        private void PopulateDataGrid()
        {
            DataGridPeople.ItemsSource = framework.GetAllPeopleList();
        }

What I have tried:

looking online to get EF to run no luck yet and trying multiple different ideas and topics.