UnivateProperties_API/Controllers/Users/RegisterController.cs

             }
             catch(Exception ex)
             {
-                return new BadRequestResult();
+                return BadRequest(new { message = ex.Message + " - " + ex.InnerException + " - " + ex.StackTrace });
             }
         }
 

UnivateProperties_API/Repository/Properties/PropertyRepository.cs

                 }
 
                 property.PropertyImages = new List<PropertyImage>();
-                var lastID = dBContext.PropertyImages.Max(i => i.Id) + 1;
+                var lastID = 0;
+                if (dBContext.PropertyImages.Count() == 0)
+                    lastID = 1;
+                else 
+                    lastID = dBContext.PropertyImages.Max(i => i.Id) + 1;
+
                 foreach (PropertyImage image in images)
                 {
                     image.PropertyId = property.Id;

UnivateProperties_API/Repository/Users/RegisterRepository.cs

 using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Mvc;
+using Microsoft.EntityFrameworkCore;
 using System;
 using System.Collections.Generic;
 using System.Drawing.Text;
                 user.PasswordSalt = passwordSalt;
             }
 
-            _dbContext.Users.Update(user);
+            //_dbContext.Users.Update(user);
+            _dbContext.Entry(user).State = EntityState.Modified;
             _dbContext.SaveChanges();
         }
 
             user.PasswordSalt = passwordSalt;
             user.FPToken = "";
 
-            _dbContext.Users.Update(user);
+            //_dbContext.Users.Update(user);
+            _dbContext.Entry(user).State = EntityState.Modified;
             Save();
         }
 
                 //send ecrypted token to db
                 user.FPToken = encryptedToken;
 
-                _dbContext.Users.Update(user);
+                _dbContext.Entry(user).State = EntityState.Modified;
+                //_dbContext.Users.Update(user);
                 _dbContext.SaveChanges();
 
                 string linkStr = encryptedToken.Replace('/', '!');