Select TensorFlow op(s), included in the given model, is(are) not supported by this interpreter. when trying load the model in flutter

Question

getting this error while trying to load a tf model I converted to tflite so I can use it in my app

I did what the message suggests and added the org.tensorflow:tensorflow-lite-select-tf-ops dep in the app/build.gradle but still no luck, when I try to load a much simpler model it loaded no problem but this model it just wont load.

Select TensorFlow op(s), included in the given model, is(are) not supported by this interpreter. Make sure you apply/link the Flex delegate before inference. For the Android, it can be resolved by adding "org.tensorflow:tensorflow-lite-select-tf-ops" dependency. See instructions: https://www.tensorflow.org/lite/guide/ops_select

this model itself is not complex at all, it is just a NER model

this is the model

MAX_SEQ_LEN = 128   
VOCAB_SIZE = 10000  
EMBEDDING_DIM = 128
RNN_UNITS = 64
NUM_TAGS = 10  


model = tf.keras.Sequential([
tf.keras.layers.Embedding(VOCAB_SIZE, EMBEDDING_DIM, input_length=MAX_SEQ_LEN),  # Static shape
tf.keras.layers.Bidirectional(tf.keras.layers.GRU(RNN_UNITS, return_sequences=True)),  # No dynamic TensorArray
tf.keras.layers.TimeDistributed(tf.keras.layers.Dense(NUM_TAGS))  # Output per token
])

this is the conversion

converter = tf.lite.TFLiteConverter.from_saved_model("ner_model")
converter.experimental_enable_resource_variables = True
converter.target_spec.supported_ops = [tf.lite.OpsSet.TFLITE_BUILTINS,   tf.lite.OpsSet.SELECT_TF_OPS]
converter._experimental_lower_tensor_list_ops = False

tflite_model = converter.convert()


with open("ner_model.tflite", "wb") as f:
f.write(tflite_model)

tflite package version used in flutter project tflite_flutter: ^0.10.4

tflite lib version used in the conversion 2.18.0