ValueError: Error when checking input: expected conv2d_1_input to have 4 dimensions, but got array with shape (8, 4)

from google_drive_downloader import GoogleDriveDownloader as gdd

gdd.download_file_from_google_drive(
    file_id='13WSlx4cmXh3wfvzNEXbZAbc2a1RHpPPP',
    dest_path='./data/klasifikacia.zip',
    unzip=True)

gdd.download_file_from_google_drive(
    file_id='1k3Lz79cF40peKCf-UdobyIUdbKZ2Onfp',
    dest_path='./data/model.h5',
    unzip=False)

import keras
import numpy as np
from keras.preprocessing.image import ImageDataGenerator
from keras.models import load_model
from matplotlib import pyplot as plt
import matplotlib.pyplot as plt
%matplotlib inline

test_path = './data/test'
model_name = 'keras_drone_trained_model.h5'

test_batches = ImageDataGenerator().flow_from_directory(test_path, target_size=(100, 100), classes=['biker', 'pedestrian', 'golf_cart', 'skater'], batch_size=8)
test_datagen = ImageDataGenerator(rescale=1./255)

def plots(ims, figsize=(12,6), rows=1, interp=False, titles=None):
  if type(ims[0]) is np.ndarray:
    ims = np.array(ims).astype(np.uint8)
    if(ims.shape[-1] != 3):
      ims = ims.transpose((0,2,3,1))
    f = plt.figure(figsize=figsize)
    cols = len(ims)//rows if len(ims)%2 == 0 else len(ims)//rows + 1
    for i in range(len (ims)):
      sp = f.add_subplot(rows, cols, i+1)
      sp.axis('Off')
      if titles is not None:
        sp.set_title(titles[i], fontsize=14)
        plt.imshow(ims[i], interpolation=None if interp else 'none')

test_imgs, test_labels = next(test_batches)
plots(test_imgs, titles=test_labels)

classes = test_batches.class_indices
print(classes)

model = load_model('data/model.h5')

x = model.predict_generator(test_batches, steps=1, verbose=0)
predict = model.predict_classes(x)
predict