Error while using flutter_tflite package Error: Run with org.tensorflow.lite.Interpreter.getInputTensor(int)' on a null object reference

[Sk-Mattes]

Body

I have a Flutter project in which an image is stored as a jpeg on the local storage. However, I always get an error as soon as I try to run the tflite model on the image. I would appreciate some help!
Kind regards!

Log with Error:

Performing hot restart...
Syncing files to device sdk gphone x86...
Restarted application in 847ms.
E/flutter ( 6884): [ERROR:flutter/runtime/dart_vm_initializer.cc(41)] Unhandled Exception: PlatformException(Failed to run model, Attempt to invoke virtual method 'org.tensorflow.lite.Tensor org.tensorflow.lite.Interpreter.getInputTensor(int)' on a null object reference, java.lang.NullPointerException: Attempt to invoke virtual method 'org.tensorflow.lite.Tensor org.tensorflow.lite.Interpreter.getInputTensor(int)' on a null object reference
E/flutter ( 6884): at sq.flutter.flutter_tflite.TflitePlugin.feedInputTensor(TflitePlugin.java:368)
E/flutter ( 6884): at sq.flutter.flutter_tflite.TflitePlugin.feedInputTensorImage(TflitePlugin.java:430)
E/flutter ( 6884): at sq.flutter.flutter_tflite.TflitePlugin.detectObjectOnImage(TflitePlugin.java:624)
E/flutter ( 6884): at sq.flutter.flutter_tflite.TflitePlugin.onMethodCall(TflitePlugin.java:157)
E/flutter ( 6884): at io.flutter.plugin.common.MethodChannel$IncomingMethodCallHandler.onMessage(MethodChannel.java:267)
E/flutter ( 6884): at io.flutter.embedding.engine.dart.DartMessenger.invokeHandler(DartMessenger.java:295)
E/flutter ( 6884): at io.flutter.embedding.engine.dart.DartMessenger.lambda$dispatchMessageToQueue$0$io-flutter-embedding-engine-dart-DartMessenger(DartMessenger.java:322)
E/flutter ( 6884): at io.flutter.embedding.engine.dart.DartMessenger$$ExternalSyntheticLambda0.run(Unknown Source:12)
E/flutter ( 6884): at android.os.Handler.handleCallback(Handler.java:938)
E/flutter ( 6884): at android.os.Handler.dispatchMessage(Handler.java:99)
E/flutter ( 6884): at android.os.Looper.loop(Looper.java:223)
E/flutter ( 6884): at android.app.ActivityThread.main(ActivityThread.java:7656)
E/flutter ( 6884): at java.lang.reflect.Method.invoke(Native Method)
E/flutter ( 6884): at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
E/flutter ( 6884): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)
E/flutter ( 6884): , null)
E/flutter ( 6884): #0 StandardMethodCodec.decodeEnvelope (package:flutter/src/services/message_codecs.dart:651:7)
E/flutter ( 6884): #1 MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:322:18)
E/flutter ( 6884):
E/flutter ( 6884): #2 Tflite.detectObjectOnImage (package:flutter_tflite/flutter_tflite.dart:113:12)
E/flutter ( 6884):
E/flutter ( 6884): #3 detectPeople (package:security_system_software/ai/ai_recognition.dart:12:22)
E/flutter ( 6884):
E/flutter ( 6884): #4 _GalleryState.SideBar. (package:security_system_software/pages/gallery.dart:82:16)
E/flutter ( 6884):
E/flutter ( 6884):

Future<bool> detectPeople(File file) async {

  initTFLite();
 
  var recognitions = await Tflite.detectObjectOnImage( //error coming up here!
    numBoxesPerBlock: 2,
    path: file.path,
    model: "SSDMobileNet",
    imageMean: 127.5,
    imageStd: 127.5,
    threshold: 0.4, 
    numResultsPerClass: 1,
  );


  for (var recog in recognitions!) {
    if (recog["detectedClass"] == "person") {
      return true;
    }
  }

  return false;
}

initTFLite() async{
  await Tflite.close();
  await Tflite.loadModel(
    model: "mobilenet_v1_1.0_224.tflite",
    labels: "mobilenet_v1_1.0_224.txt",
    isAsset: true,
    numThreads: 1,
    useGpuDelegate: false,
  );
}

Just so you guys know i included aaptOptions and i properly loaded model and label at least in my opinion.

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[Sk-Mattes]

Thanks for you answer at least i have a new error now , so hopefully it fixed one problem !

The new error log:
FATAL EXCEPTION: AsyncTask #2
E/AndroidRuntime( 7781): Process: de.seekamp.security_system_software, PID: 7781
E/AndroidRuntime( 7781): java.lang.RuntimeException: An error occurred while executing doInBackground()
E/AndroidRuntime( 7781): at android.os.AsyncTask$3.done(AsyncTask.java:353)
E/AndroidRuntime( 7781): at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:383)
E/AndroidRuntime( 7781): at java.util.concurrent.FutureTask.setException(FutureTask.java:252)
E/AndroidRuntime( 7781): at java.util.concurrent.FutureTask.run(FutureTask.java:271)
E/AndroidRuntime( 7781): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:245)
E/AndroidRuntime( 7781): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1162)
E/AndroidRuntime( 7781): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:636)
E/AndroidRuntime( 7781): at java.lang.Thread.run(Thread.java:764)
E/AndroidRuntime( 7781): Caused by: java.lang.IllegalArgumentException: Cannot copy from a TensorFlowLite tensor (MobilenetV1/Predictions/Reshape_1) with shape [1, 1001] to a Java object with shape [1, 1001, 4].
E/AndroidRuntime( 7781): at org.tensorflow.lite.TensorImpl.throwIfDstShapeIsIncompatible(TensorImpl.java:464)
E/AndroidRuntime( 7781): at org.tensorflow.lite.TensorImpl.copyTo(TensorImpl.java:226)
E/AndroidRuntime( 7781): at org.tensorflow.lite.NativeInterpreterWrapper.run(NativeInterpreterWrapper.java:278)
E/AndroidRuntime( 7781): at org.tensorflow.lite.InterpreterImpl.runForMultipleInputsOutputs(InterpreterImpl.java:101)
E/AndroidRuntime( 7781): at org.tensorflow.lite.Interpreter.runForMultipleInputsOutputs(Interpreter.java:95)
E/AndroidRuntime( 7781): at sq.flutter.tflite.TflitePlugin$RunSSDMobileNet.runTflite(TflitePlugin.java:710)
E/AndroidRuntime( 7781): at sq.flutter.tflite.TflitePlugin$TfliteTask.doInBackground(TflitePlugin.java:507)
E/AndroidRuntime( 7781): at sq.flutter.tflite.TflitePlugin$TfliteTask.doInBackground(TflitePlugin.java:481)
E/AndroidRuntime( 7781): at android.os.AsyncTask$2.call(AsyncTask.java:333)
E/AndroidRuntime( 7781): at java.util.concurrent.FutureTask.run(FutureTask.java:266)
E/AndroidRuntime( 7781): ... 4 more