Invalid type in JSON write (MSGraphMessage)

[matti157]

I think it is related to the issue #27 and to pull request #36

I'm trying to send an email from iOS following the example I find here https://docs.microsoft.com/en-us/graph/api/user-sendmail?view=graph-rest-1.0&tabs=objc

MSHTTPClient *httpClient = [MSClientFactory createHTTPClientWithAuthenticationProvider:authenticationProvider];

NSString *MSGraphBaseURL = @"https://graph.microsoft.com/v1.0/";
NSMutableURLRequest *urlRequest = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:[MSGraphBaseURL stringByAppendingString:@"/me/sendMail"]]];
[urlRequest setHTTPMethod:@"POST"];
[urlRequest setValue:@"application/json" forHTTPHeaderField:@"Content-Type"];

NSMutableDictionary *payloadDictionary = [[NSMutableDictionary alloc] init];

MSGraphMessage *message = [[MSGraphMessage alloc] init];
[message setSubject:@"Meet for lunch?"];
MSGraphItemBody *body = [[MSGraphItemBody alloc] init];
[body setContentType: [MSGraphBodyType text]];
[body setContent:@"The new cafeteria is open."];
[message setBody:body];
NSMutableArray *toRecipientsList = [[NSMutableArray alloc] init];
MSGraphRecipient *toRecipients = [[MSGraphRecipient alloc] init];
MSGraphEmailAddress *emailAddress = [[MSGraphEmailAddress alloc] init];
[emailAddress setAddress:@"meganb@contoso.onmicrosoft.com"];
[toRecipients setEmailAddress:emailAddress];
[toRecipientsList addObject: toRecipients];
[message setToRecipients:toRecipientsList];
NSMutableArray *attachmentsList = [[NSMutableArray alloc] init];
MSGraphAttachment *attachments = [[MSGraphAttachment alloc] init];
[attachments setName:@"attachment.txt"];
[attachments setContentType:@"text/plain"];
[attachments setContentBytes:@"SGVsbG8gV29ybGQh"];
[attachmentsList addObject: attachments];
[message setAttachments:attachmentsList];
payloadDictionary[@"message"] = message;

NSData *data = [NSJSONSerialization dataWithJSONObject:payloadDictionary options:kNilOptions error:&error];
[urlRequest setHTTPBody:data];

MSURLSessionDataTask *meDataTask = [httpClient dataTaskWithRequest:urlRequest 
	completionHandler: ^(NSData *data, NSURLResponse *response, NSError *nserror) {

		
}];

[meDataTask execute];

The crash occurs at the line
NSData *data = [NSJSONSerialization dataWithJSONObject:payloadDictionary options:kNilOptions error:&error];

libc++abi: terminating with uncaught exception of type NSException *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Invalid type in JSON write (MSGraphMessage)' terminating with uncaught exception of type NSException