Class com.owncloud.android.lib.resources.assistant.v2.AssistantV2Tests

kotlinx.serialization.SerializationException: Serializer for subclass 'HashMap' is not found in the polymorphic scope of 'Serializable'.
Check if class with serial name 'HashMap' exists and serializer is registered in a corresponding SerializersModule.
To be registered automatically, class 'HashMap' has to be '@Serializable', and the base class 'Serializable' has to be sealed and '@Serializable'.
at kotlinx.serialization.internal.AbstractPolymorphicSerializerKt.throwSubtypeNotRegistered(AbstractPolymorphicSerializer.kt:102)
at kotlinx.serialization.internal.AbstractPolymorphicSerializerKt.throwSubtypeNotRegistered(AbstractPolymorphicSerializer.kt:114)
at kotlinx.serialization.PolymorphicSerializerKt.findPolymorphicSerializer(PolymorphicSerializer.kt:109)
at kotlinx.serialization.json.internal.StreamingJsonEncoder.encodeSerializableValue(StreamingJsonEncoder.kt:250)
at kotlinx.serialization.internal.NullableSerializer.serialize(NullableSerializer.kt:23)
at kotlinx.serialization.json.internal.StreamingJsonEncoder.encodeSerializableValue(StreamingJsonEncoder.kt:259)
at kotlinx.serialization.encoding.AbstractEncoder.encodeSerializableElement(AbstractEncoder.kt:80)
at kotlinx.serialization.internal.MapLikeSerializer.serialize(CollectionSerializers.kt:123)
at kotlinx.serialization.json.internal.StreamingJsonEncoder.encodeSerializableValue(StreamingJsonEncoder.kt:259)
at kotlinx.serialization.json.internal.JsonStreamsKt.encodeByWriter(JsonStreams.kt:99)
at kotlinx.serialization.json.Json.encodeToString(Json.kt:125)
at com.owncloud.android.lib.resources.assistant.v2.CreateTaskRemoteOperationV2.buildRequestBody(CreateTaskRemoteOperationV2.kt:57)
at com.owncloud.android.lib.resources.assistant.v2.CreateTaskRemoteOperationV2.run(CreateTaskRemoteOperationV2.kt:40)
at com.owncloud.android.lib.common.operations.RemoteOperation.execute(RemoteOperation.java:208)
at com.owncloud.android.lib.resources.assistant.v2.AssistantV2Tests.testDeleteTask(AssistantV2Tests.kt:86)

kotlinx.serialization.SerializationException: Serializer for subclass 'HashMap' is not found in the polymorphic scope of 'Serializable'.
Check if class with serial name 'HashMap' exists and serializer is registered in a corresponding SerializersModule.
To be registered automatically, class 'HashMap' has to be '@Serializable', and the base class 'Serializable' has to be sealed and '@Serializable'.
at kotlinx.serialization.internal.AbstractPolymorphicSerializerKt.throwSubtypeNotRegistered(AbstractPolymorphicSerializer.kt:102)
at kotlinx.serialization.internal.AbstractPolymorphicSerializerKt.throwSubtypeNotRegistered(AbstractPolymorphicSerializer.kt:114)
at kotlinx.serialization.PolymorphicSerializerKt.findPolymorphicSerializer(PolymorphicSerializer.kt:109)
at kotlinx.serialization.json.internal.StreamingJsonEncoder.encodeSerializableValue(StreamingJsonEncoder.kt:250)
at kotlinx.serialization.internal.NullableSerializer.serialize(NullableSerializer.kt:23)
at kotlinx.serialization.json.internal.StreamingJsonEncoder.encodeSerializableValue(StreamingJsonEncoder.kt:259)
at kotlinx.serialization.encoding.AbstractEncoder.encodeSerializableElement(AbstractEncoder.kt:80)
at kotlinx.serialization.internal.MapLikeSerializer.serialize(CollectionSerializers.kt:123)
at kotlinx.serialization.json.internal.StreamingJsonEncoder.encodeSerializableValue(StreamingJsonEncoder.kt:259)
at kotlinx.serialization.json.internal.JsonStreamsKt.encodeByWriter(JsonStreams.kt:99)
at kotlinx.serialization.json.Json.encodeToString(Json.kt:125)
at com.owncloud.android.lib.resources.assistant.v2.CreateTaskRemoteOperationV2.buildRequestBody(CreateTaskRemoteOperationV2.kt:57)
at com.owncloud.android.lib.resources.assistant.v2.CreateTaskRemoteOperationV2.run(CreateTaskRemoteOperationV2.kt:40)
at com.owncloud.android.lib.common.operations.RemoteOperation.execute(RemoteOperation.java:208)
at com.owncloud.android.lib.resources.assistant.v2.AssistantV2Tests.testGetTaskList(AssistantV2Tests.kt:70)