Invalid username or password error message

app/src/main/java/org/tasks/caldav/BaseCaldavAccountSettingsActivity.java

@@ -273,7 +273,11 @@ public abstract class BaseCaldavAccountSettingsActivity extends ThemedInjectingA
     hideProgressIndicator();
 
     if (t instanceof HttpException) {
+      if (((HttpException) t).getCode() == 401) {
+        showSnackbar(R.string.invalid_username_or_password);
+      } else {
         showSnackbar(t.getMessage());
+      }
     } else if (t instanceof DisplayableException) {
       showSnackbar(((DisplayableException) t).getResId());
     } else if (t instanceof ConnectException) {

app/src/main/java/org/tasks/caldav/CaldavClient.java

@@ -175,6 +175,10 @@ public class CaldavClient {
     try {
       principal = tryFindPrincipal("/.well-known/caldav");
     } catch (Exception e) {
+      if (e instanceof HttpException && ((HttpException) e).getCode() == 401) {
+        throw e;
+      }
+
       Timber.w(e);
     }
     if (principal == null) {

app/src/main/res/values/strings.xml

@@ -581,4 +581,5 @@ File %1$s contained %2$s.\n\n
   <string name="disable_battery_optimizations">Disable battery optimizations</string>
   <string name="more_settings">More settings</string>
   <string name="more_notification_settings_summary">Ringtone, vibrations, and more</string>
+  <string name="invalid_username_or_password">Invalid username or password</string>
 </resources>