Hi @Ugur_Ercelik it seems that the project builds OK to my AS.
Download again the projects from here 7 go to the image_classification/android folder and build it again.
Also check that inside Classifier.java file there is:
/** The model type used for classification. */
  public enum Model {
    FLOAT_MOBILENET,
    QUANTIZED_MOBILENET,
    FLOAT_EFFICIENTNET,
    QUANTIZED_EFFICIENTNET
  }

Best