Error reported in Google Cloud functions: message 'undefined' is not a valid object and no handlebars template has been provided instead

Question

I'm trying to send an email from my Android Firebase app to an arbitrary email address using the Trigger Email extension. Following this tutorial, I first set up the outbound mail service using sendGrid and tested it. Next, I created a Firestore documents collection named 'email' and set up some security rules for the collection. Finally, I installed the Trigger Email extension into my project and specified sender address, etc.

The code that adds email documents to the collection is as follows:

    private HashMap<String, String> emailMap = new HashMap<>();
                  .
                  .
                  .

    spinner.setVisibility(View.INVISIBLE);
    Map<String, Object> data = new HashMap<>();
    data.put("to", emailaddr);
    emailMap.clear();
    emailMap.put("subject", getString(R.string.post_alert));
    emailMap.put("html", getString(R.string.posted_comment) + NL + NL + WEB_APP + url);
    data.put("message", emailMap);
    emailRef.add(data)
            .addOnSuccessListener(new OnSuccessListener<DocumentReference>() {
            @Override
            public void onSuccess(DocumentReference documentReference) {
                spinner.setVisibility(View.INVISIBLE);

            }
        })
        .addOnFailureListener(new OnFailureListener() {
            @Override
            public void onFailure(@NonNull Exception e) {
                Log.w(TAG, "Error writing document", e);
                Toast.makeText(context, e.getLocalizedMessage(), Toast.LENGTH_LONG).show();
                spinner.setVisibility(View.INVISIBLE);
            }
        });

and, in fact, the document gets created and looks good:

However, the email never gets sent. Looking through the the Google Cloud functions logs, I see the following:

My question is, why is 'message' not a valid object? It looks OK to me.

Answer 1

The problem I was having was due to two errors I made in configuring the Trigger email extension: the SMTP password was missing and I had the name of the email collection wrong.

I got past the problem I originally posted, now I've got a different one: the extension tried to send the email and updated the email document with an error:

Has anyone seen this error before?