Postman Error

System.InvalidOperationException: An exception was thrown while attempting to evaluate the LINQ query parameter expression 'value(DataAccess.Concrete.EntityFramework.EfUserDal+<>c__DisplayClass0_0).user.Id'. See the inner exception for more information. ---> System.NullReferenceException: Object reference not set to an instance of an object. at lambda_method(Closure ) at Microsoft.EntityFrameworkCore.Query.Internal.ParameterExtractingExpressionVisitor.GetValue(Expression expression, String& parameterName) --- End of inner exception stack trace --- at Microsoft.EntityFrameworkCore.Query.Internal.ParameterExtractingExpressionVisitor.GetValue(Expression expression, String& parameterName) at Microsoft.EntityFrameworkCore.Query.Internal.ParameterExtractingExpressionVisitor.Evaluate(Expression expression, Boolean generateParameter) at Microsoft.EntityFrameworkCore.Query.Internal.ParameterExtractingExpressionVisitor.Visit(Expression expression) at System.Linq.Expressions.ExpressionVisitor.VisitBinary(BinaryExpression node) at Microsoft.EntityFrameworkCore.Query.Internal.ParameterExtractingExpressionVisitor.VisitBinary(BinaryExpression binaryExpression) at System.Linq.Expressions.BinaryExpression.Accept(ExpressionVisitor visitor) at System.Linq.Expressions.ExpressionVisitor.Visit(Expression node) at Microsoft.EntityFrameworkCore.Query.Internal.ParameterExtractingExpressionVisitor.Visit(Expression expression) at System.Linq.Expressions.ExpressionVisitor.VisitLambda[T](Expression`1 node) at System.Linq.Expressions.Expression`1.Accept(ExpressionVisitor visitor) at System.Linq.Expressions.ExpressionVisitor.Visit(Expression node) at Microsoft.EntityFrameworkCore.Query.Internal.ParameterExtractingExpressionVisitor.Visit(Expression expression) at System.Linq.Expressions.ExpressionVisitor.VisitUnary(UnaryExpression node) at System.Linq.Expressions.UnaryExpression.Accept(ExpressionVisitor visitor) at System.Linq.Expressions.ExpressionVisitor.Visit(Expression node) at Microsoft.EntityFrameworkCore.Query.Internal.ParameterExtractingExpressionVisitor.Visit(Expression expression) at System.Dynamic.Utils.ExpressionVisitorUtils.VisitArguments(ExpressionVisitor visitor, IArgumentProvider nodes) at System.Linq.Expressions.ExpressionVisitor.VisitMethodCall(MethodCallExpression node) at System.Linq.Expressions.MethodCallExpression.Accept(ExpressionVisitor visitor) at System.Linq.Expressions.ExpressionVisitor.Visit(Expression node) at Microsoft.EntityFrameworkCore.Query.Internal.ParameterExtractingExpressionVisitor.Visit(Expression expression) at System.Dynamic.Utils.ExpressionVisitorUtils.VisitArguments(ExpressionVisitor visitor, IArgumentProvider nodes) at System.Linq.Expressions.ExpressionVisitor.VisitMethodCall(MethodCallExpression node) at System.Linq.Expressions.MethodCallExpression.Accept(ExpressionVisitor visitor) at System.Linq.Expressions.ExpressionVisitor.Visit(Expression node) at Microsoft.EntityFrameworkCore.Query.Internal.ParameterExtractingExpressionVisitor.Visit(Expression expression) at Microsoft.EntityFrameworkCore.Query.Internal.ParameterExtractingExpressionVisitor.ExtractParameters(Expression expression) at Microsoft.EntityFrameworkCore.Query.Internal.QueryCompiler.ExtractParameters(Expression query, IParameterValues parameterValues, IDiagnosticsLogger`1 logger, Boolean parameterize, Boolean generateContextAccessors) at Microsoft.EntityFrameworkCore.Query.Internal.QueryCompiler.Execute[TResult](Expression query) at Microsoft.EntityFrameworkCore.Query.Internal.EntityQueryProvider.Execute[TResult](Expression expression) at Microsoft.EntityFrameworkCore.Query.Internal.EntityQueryable`1.GetEnumerator() at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection) at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source) at DataAccess.Concrete.EntityFramework.EfUserDal.GetClaims(User user) in /home/mert/Desktop/Project/ReCapProject/DataAccess/Concrete/EntityFramework/EfUserDal.cs:line 20 at Business.Concrete.UserManager.GetClaims(User user) in /home/mert/Desktop/Project/ReCapProject/Business/Concrete/UserManager.cs:line 19 at Castle.Proxies.Invocations.IUserService_GetClaims.InvokeMethodOnTarget() at Castle.DynamicProxy.AbstractInvocation.Proceed() at Castle.Proxies.IUserServiceProxy.GetClaims(User user) at Business.Concrete.AuthManager.CreateAccessToken(User user) in /home/mert/Desktop/Project/ReCapProject/Business/Concrete/AuthManager.cs:line 67 at Castle.Proxies.Invocations.IAuthService_CreateAccessToken.InvokeMethodOnTarget() at Castle.DynamicProxy.AbstractInvocation.Proceed() at Castle.Proxies.IAuthServiceProxy.CreateAccessToken(User user) at WebAPI.Controllers.AuthController.Register(UserForRegisterDto userForRegisterDto) in /home/mert/Desktop/Project/ReCapProject/WebAPI/Controllers/AuthController.cs:line 51 at lambda_method(Closure , Object , Object[] ) at Microsoft.Extensions.Internal.ObjectMethodExecutor.Execute(Object target, Object[] parameters) at Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor.SyncActionResultExecutor.Execute(IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments) at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeActionMethodAsync() at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted) at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeNextActionFilterAsync() --- End of stack trace from previous location where exception was thrown --- at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Rethrow(ActionExecutedContextSealed context) at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted) at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeInnerFilterAsync() --- End of stack trace from previous location where exception was thrown --- at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeFilterPipelineAsync>g__Awaited|19_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted) at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope) at Microsoft.AspNetCore.Routing.EndpointMiddleware.<Invoke>g__AwaitRequestTask|6_0(Endpoint endpoint, Task requestTask, ILogger logger) at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context) at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context) at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)