The property or field has not been initialized. It has not been requested or the request has not been executed

Question

Hello!
I sometimes have a problem wnen I work with CSOM for SharePoint Online.
I make this request :
var list = context.Web.Lists.GetById(listid);
item = list.GetItemById(id);
context.Load(item);
context.ExecuteQueryRetry();
context.Load(item, x => x, x => x.HasUniqueRoleAssignments, x => x.Id, x => x.ContentType.Id,
x => x.RoleAssignments, x => x.RoleAssignments.Include(y => y.RoleDefinitionBindings, y => y.PrincipalId));
context.ExecuteQueryRetry();
After that I try get LookupId :
((FieldLookupValue)item[TaskList.Expertise]).LookupId;
and I catch the error :
The property or field has not been initialized. It has not been requested or the request has not been executed. It may need to be explicitly requested. Stack: at Microsoft.SharePoint.Client.ListItem.GetFieldValue(String fieldName)
I don't understand, why doesn't this error happen all the time?It happens about twice a week.
I use Microsoft.SharePoint.Client, Version=16.1.0.0 and OfficeDevPnP.Core, Version=3.20.2004.0
Thanks!

Answer 1

The item has been loaded in the clientContext, and this problem should not occur.
I test with SharePoint.Client, Version=16.1.0.0 and OfficeDevPnP.Core, Version=3.26.2010.0. And I do not reproduce your issue.

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Answer 2

@Amos Wu-MSFT Thank! I don't reproduce too.This error occurs in runtime only and it happens about twice a week. This situations is critical for me, because error occurs in big service. Service works for many people,but all requests are made by one service account. Maybe there are restrictions on the number of requests from one account?

Answer 3

@Amos Wu-MSFT Do you have a source code of ExecuteQueryRetry()?