fixed exception

DbContext/QuoteDbContext.cs

@@ -31,6 +31,7 @@ public class QuoteDbContext : DbContext
             entity.Property(q => q.Author).IsRequired().HasMaxLength(255);
             entity.Property(q => q.QuoteText).IsRequired().HasMaxLength(1000);
             entity.Property(q => q.Source).HasMaxLength(255);
+            entity.Property(q => q.DataSet).IsRequired().HasMaxLength(255);
             entity.Property(q => q.Book).HasMaxLength(255);
             entity.Property(q => q.Categories).HasMaxLength(255);
             entity.Property(q => q.Url).HasMaxLength(500);

Program.cs

@@ -280,7 +280,7 @@ async Task SeedDatabase(QuoteDbContext db)
 using (var scope = app.Services.CreateScope())
 {
     var db = scope.ServiceProvider.GetRequiredService<QuoteDbContext>();
-    db.Database.EnsureCreated();
+    //db.Database.EnsureCreated();
 
     GlobalData.Quotes = await db.Quotes.ToListAsync();
     //await SeedDatabase(db);