Nextcloud Notes App not syncing. "The response from your server is incorrect."

[RedRiges]

This issue respects the following points:

• I have read the FAQ
• I have searched for existing issues
• The issue affects the Notes Android app, neither the Notes server app nor the Nextcloud Android app.

Describe the bug

1. Trying to login with my account after updating Nextcloud server to 31.0.7
2. Getting an error "The response from your server is incorrect. Please check if login via the web interface is working."
3. But login via the web interface is working well. The general Nextcloud android app also works fine.
4. I tried using versions of Notes both from Google Play Store and F-Droid

Expected behavior

No response

Notes Android version

4.4.0

Notes server version

4.12.2

Nextcloud Android version

3.32.0

Nextcloud version

31.0.7

Device

Sony Xperia 1 III

Android Version

11

App Store

• Google Play Store
• F-Droid
• Huawei App Gallery

Stacktrace

App Version: 4.4.0
App Version Code: 40040090
App Flavor: play

Files App Version Code: 30320090 (PROD)

---

OS Version: 5.4.61-qgki-00388-g3ca34e0d01ac(061000A023002002163851124)
OS API Level: 30
Device: XQ-BC72
Manufacturer: Sony
Model (and Product): XQ-BC72 (XQ-BC72_RU)

---

java.lang.NullPointerException: Attempt to invoke virtual method 'com.google.gson.JsonPrimitive com.google.gson.JsonObject.getAsJsonPrimitive(java.lang.String)' on a null object reference
	at it.niedermann.owncloud.notes.persistence.sync.CapabilitiesDeserializer.deserialize(CapabilitiesDeserializer.java:75)
	at it.niedermann.owncloud.notes.persistence.sync.CapabilitiesDeserializer.deserialize(CapabilitiesDeserializer.java:32)
	at com.google.gson.internal.bind.TreeTypeAdapter.read(TreeTypeAdapter.java:95)
	at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$2.readIntoField(ReflectiveTypeAdapterFactory.java:271)
	at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$FieldReflectionAdapter.readField(ReflectiveTypeAdapterFactory.java:561)
	at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:519)
	at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$2.readIntoField(ReflectiveTypeAdapterFactory.java:271)
	at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$FieldReflectionAdapter.readField(ReflectiveTypeAdapterFactory.java:561)
	at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:519)
	at com.google.gson.Gson.fromJson(Gson.java:1359)
	at com.google.gson.Gson.fromJson(Gson.java:1260)
	at com.google.gson.Gson.fromJson(Gson.java:1228)
	at com.nextcloud.android.sso.api.NextcloudAPI.convertStreamToTargetEntity(NextcloudAPI.java:136)
	at com.nextcloud.android.sso.api.NextcloudAPI.lambda$performRequestObservableV2$0(NextcloudAPI.java:98)
	at com.nextcloud.android.sso.api.NextcloudAPI.$r8$lambda$af7W9mq2B0ZrhVJwZd-ibFp8T3Y(Unknown Source:0)
	at com.nextcloud.android.sso.api.NextcloudAPI$$ExternalSyntheticLambda1.subscribe(D8$$SyntheticClass:0)
	at io.reactivex.internal.operators.observable.ObservableFromPublisher.subscribeActual(ObservableFromPublisher.java:31)
	at io.reactivex.Observable.subscribe(Observable.java:12284)
	at io.reactivex.internal.operators.observable.ObservableSingleMaybe.subscribeActual(ObservableSingleMaybe.java:31)
	at io.reactivex.Maybe.subscribe(Maybe.java:4290)
	at io.reactivex.Maybe.blockingGet(Maybe.java:2320)
	at io.reactivex.Observable.blockingSingle(Observable.java:5381)
	at it.niedermann.owncloud.notes.persistence.CapabilitiesClient.getCapabilities(CapabilitiesClient.java:38)
	at it.niedermann.owncloud.notes.importaccount.ImportAccountActivity.lambda$onActivityResult$5(ImportAccountActivity.java:104)
	at it.niedermann.owncloud.notes.importaccount.ImportAccountActivity.$r8$lambda$wIJzzcgrzM9d6k7exwdLMn3GvgQ(Unknown Source:0)
	at it.niedermann.owncloud.notes.importaccount.ImportAccountActivity$$ExternalSyntheticLambda4.run(D8$$SyntheticClass:0)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:462)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
	at java.lang.Thread.run(Thread.java:923)

[Atesca]

With the setting "Allow apps to use the Share API" in Administration --> Sharing disabled the API-Response doesn't include a "password"-object under "public"

curl -s -u 'user:password' -X 'GET' 'https://nextcloud/ocs/v2.php/cloud/capabilities?format=json' -H 'OCS-APIRequest: true' | jq '.ocs.data.capabilities.files_sharing'

{
  "api_enabled": false,
  "public": {
    "enabled": false
  },
  "user": {
    "send_mail": false
  },
  "resharing": false,
  "federation": {
    "outgoing": false,
    "incoming": false,
    "expire_date": {
      "enabled": true
    },
    "expire_date_supported": {
      "enabled": true
    }
  },
  "sharee": {
    "query_lookup_default": false,
    "always_show_unique": true
  }
}

Looking at the server code https://github.com/nextcloud/server/blob/1e0ea9cc99c8d27f1da2650870ac347a90d63b33/apps/files_sharing/lib/Capabilities.php#L36 the "password"-object is defined as optional

Looking at the app code

notes-android/app/src/main/java/it/niedermann/owncloud/notes/persistence/sync/CapabilitiesDeserializer.java

Line 74 in 621fef7

final var password = publicObject.getAsJsonObject("password");

it doesn't check if public.enabled is true and tries to access the "password"-object regardless

[robboblah]

also impacted by the same issue.

Notes Android version
4.4.0 & 4.4.1

Notes server version
4.12.2

Nextcloud Android version
3.32.2

Nextcloud version
31.0.7

Device
Pixel 9 Pro XL

Android Version
16

[user8446]

I'm seeing the same issue but I noticed when first opening the app it syncs as expected but the error appears if you manually try to refresh.

Also downgrading back to v4.3.1 and this issue goes away.

[Ra72xx]

Moreover, the Notes app in my case seems to stay active in tbe background and drains battery. I don't know if this is related.

[bonbonboi]

I have the same issue when setting up the Notes app. I installed the Nextcloud app, logged in, opened the Notes app, and granted it permission to connect to my Nextcloud account. Then, it displayed an error message:

java.lang.NullPointerException: Attempt to invoke virtual method 'com.google.gson.JsonPrimitive com.google.gson.JsonObject.getAsJsonPrimitive(java.lang.String)' on a null object reference at it.niedermann.owncloud.notes.persistence.sync.CapabilitiesDeserializer.deserialize(CapabilitiesDeserializer.java:75) at it.niedermann.owncloud.notes.persistence.sync.CapabilitiesDeserializer.deserialize(CapabilitiesDeserializer.java:32) at com.google.gson.internal.bind.TreeTypeAdapter.read(TreeTypeAdapter.java:95) at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$2.readIntoField(ReflectiveTypeAdapterFactory.java:271) at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$FieldReflectionAdapter.readField(ReflectiveTypeAdapterFactory.java:561) at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:519) at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$2.readIntoField(ReflectiveTypeAdapterFactory.java:271) at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$FieldReflectionAdapter.readField(ReflectiveTypeAdapterFactory.java:561) at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:519) at com.google.gson.Gson.fromJson(Gson.java:1359) at com.google.gson.Gson.fromJson(Gson.java:1260) at com.google.gson.Gson.fromJson(Gson.java:1228) at com.nextcloud.android.sso.api.NextcloudAPI.convertStreamToTargetEntity(NextcloudAPI.java:136) at com.nextcloud.android.sso.api.NextcloudAPI.lambda$performRequestObservableV2$0(NextcloudAPI.java:98) at com.nextcloud.android.sso.api.NextcloudAPI.$r8$lambda$af7W9mq2B0ZrhVJwZd-ibFp8T3Y(Unknown Source:0) at com.nextcloud.android.sso.api.NextcloudAPI$$ExternalSyntheticLambda1.subscribe(D8$$SyntheticClass:0) at io.reactivex.internal.operators.observable.ObservableFromPublisher.subscribeActual(ObservableFromPublisher.java:31) at io.reactivex.Observable.subscribe(Observable.java:12284) at io.reactivex.internal.operators.observable.ObservableSingleMaybe.subscribeActual(ObservableSingleMaybe.java:31) at io.reactivex.Maybe.subscribe(Maybe.java:4290) at io.reactivex.Maybe.blockingGet(Maybe.java:2320) at io.reactivex.Observable.blockingSingle(Observable.java:5381) at it.niedermann.owncloud.notes.persistence.CapabilitiesClient.getCapabilities(CapabilitiesClient.java:38) at it.niedermann.owncloud.notes.importaccount.ImportAccountActivity.lambda$onActivityResult$5(ImportAccountActivity.java:103) at it.niedermann.owncloud.notes.importaccount.ImportAccountActivity.$r8$lambda$wIJzzcgrzM9d6k7exwdLMn3GvgQ(Unknown Source:0) at it.niedermann.owncloud.notes.importaccount.ImportAccountActivity$$ExternalSyntheticLambda4.run(D8$$SyntheticClass:0) at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:524) at java.util.concurrent.FutureTask.run(FutureTask.java:317) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1156) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:651) at java.lang.Thread.run(Thread.java:1119)

[Dino23]

Getting the same problem at one of two instances.
My "old" long time running Nextcloud AIO throwing the exact same error.

Another new installed AIO instance works as expected. Both on same NC and Notes App Version. Both using LDAP and traefik.