S. Miller S. Miller - 4 months ago 10
Android Question

How can I resolve the "Didn't find class 'com.google.android.gms.auth.GoogleAuthUtil'" error?

I am trying to use the Google Calendar API for the first time in Android Studio, and this class is crashing once it gets to the

mService.events().insert("primary", event).execute();


The error say
"Didn't find class "com.google.android.gms.auth.GoogleAuthUtil" on path: DexPathList"

public class CalendarRequestTask extends AsyncTask<Task, Void, Boolean> {
private com.google.api.services.calendar.Calendar mService = null;
private Exception mLastError = null;

public CalendarRequestTask(GoogleAccountCredential credential) {
HttpTransport transport = AndroidHttp.newCompatibleTransport();
JsonFactory jsonFactory = JacksonFactory.getDefaultInstance();
mService = new com.google.api.services.calendar.Calendar.Builder(
transport, jsonFactory, credential)
.setApplicationName("Task Tracker")

* Background task to call Google Calendar API.
* @tasks has the date, title, summary of the event.
protected Boolean doInBackground(Task... tasks) {
try {
return true;
} catch (Exception e) {
mLastError = e;
return false;

private void setEventInApi(Task... tasks) throws IOException {
// Insert an event into the Google Calendar

for (Task task: tasks) {
Event event = new Event()
DateTime startTime = new DateTime(task.getDueDate());
EventDateTime start = new EventDateTime()
mService.events().insert("primary", event).execute();


I solved it.

Add the following in app build.gradle (Module:app)

compile 'com.google.android.gms:play-services-auth:9.0.2'

Add the following in project build.gradle (Project:ProjectName)

dependencies {
classpath 'com.google.gms:google-services:1.5.0'

Clean and Rebuild.