ValueError: Could not interpret optimizer identifier: <keras_adamw.optimizers_v2.AdamW object at 0x0000021E2F81D220>

[yuyadanyadan]

Hello:
When I run the example, I had the error "ValueError: Could not interpret optimizer identifier: <keras_adamw.optimizers_v2.AdamW object at 0x0000021E2F81D220>". It is may be the different between keras and tf.keras. But when I change the lib as "
import numpy as np
import os
os.environ['TF_KERAS'] = '1'
from tensorflow.keras.layers import Input, Dense, LSTM
from tensorflow.keras.models import Model
from tensorflow.keras.regularizers import l1, l2, l1_l2

from keras_adamw import AdamW"
And I run under the tensorflow environment

[OverLordGoldDragon]

Are you using TensorFlow <=2.3.1? That's the last supported version.

[yuyadanyadan]

Are you using TensorFlow <=2.3.1? That's the last supported version.

My tensorflow is 2.6. This means I need a lower version of TensorFlow?