the object has been updated by another user since it was last fetched

Question

I'm added somefield so my SharePoint solution but i keep getting the error the object has been updated by another user since it was last fetched.

foreach (var field in new PageAndFieldData().Fields)
{

    var spField = web.Fields.FirstOrDefault(i => i.InternalName == field.field_name); // if dont exist = create

    if (spField == null)
    {
        var fieldXml = field.Xml;
        var newspField = web.Fields.AddFieldAsXml(fieldXml, false, AddFieldOptions.DefaultValue);
        if (groups.Contains(field.group_name))
            newspField.Group = field.group_name;
        else
        {
            newspField.Group = field.group_name;
        }
        _Ctx.Load(newspField);
        _Ctx.ExecuteQuery(); <--- This line throws the error
    }
}

Can someone point out why it keeps throwing an error.

Answer 1

Make sure field schema (fieldXml variable in your case) does not contain Version attribute otherwise SharePoint considers the field is getting updated.

For example, the error will occur while creating a field using the following field schema:

<Field Version='1' Type='Geolocation' DisplayName='Location' /> 

and will not with:

<Field Type='Geolocation' DisplayName='Location' />