Read the file in the document library: "Label applied to this element ..." C #

Question

Read the file in the document library: "Label applied to this element ..." C #

I am trying to read the contents of a file as a stream in a document library on a sharepoint website. I use AppOnlyAccessToken. The source code works until today. And I have no idea about this problem. My source code:

string realm = TokenHelper.GetRealmFromTargetUrl(SiteUrl);
var token = TokenHelper.GetAppOnlyAccessToken(TokenHelper.SharePointPrincipal, SiteUrl.Authority, realm);

var context = TokenHelper.GetClientContextWithAccessToken(SiteUrl.ToString(), token.AccessToken);

//Initial
Stream stream = null;

var list = context.Web.GetList("/sites/mysites/mydoclib");

var document = list.GetItemById(fileId);
context.Load(document.File);
context.ExecuteQuery();

////Read File and return stream content of file
var streamX = document.File.OpenBinaryStream();

context.ExecuteQuery();
stream = streamX.Value;
return stream;