exception

[Kimo11335]

Sample Name:
https://developers.google.com/drive/api/v3/quickstart/dotnet
foreach (MessagePart p in emailInfoResponse.Payload.Parts)
{
if (p.MimeType == "text/html")
{
byte[] data = FromBase64ForUrlString(p.Body.Data);
string decodedString = Encoding.UTF8.GetString(data);

                                }
                            }                   

Expected Behavior

Exception:
An unhandled exception of type 'System.NullReferenceException' occurred in Gmail.exe
Additional information: Object reference not set to an instance of an object.

Specifications

• .NET version:
• OS (Mac/Linux/Windows):