Cannot convert null literal to non-nullable reference type.

Cannot convert null literal to non-nullable reference type.

Cannot convert null literal to non-nullable reference type.

Cannot convert null literal to non-nullable reference type.

Non-nullable property 'PersonnelNumber' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'Name' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'Position' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

Non-nullable property 'Department' must contain a non-null value when exiting constructor. Consider declaring the property as nullable.

'DatabaseErrorPageExtensions.UseDatabaseErrorPage(IApplicationBuilder)' is obsolete: 'This is obsolete and will be removed in a future version. Use DatabaseDeveloperPageExceptionFilter instead, see documentation at https://aka.ms/DatabaseDeveloperPageExceptionFilter.'