Exception error while trying to load nlu pretrained model

Question

I am trying to load nlu pretrained model but it throws the below error :

Exception: Something went wrong during creating the Spark NLP model_anno_obj for your request = en.med_ner.diseasesDid you use a NLU Spell?

i am able to load nlu.load('biobert'), nlu.load('sentiment') & such other models but fails for nlu.load("en.med_ner.diseases"), nlu.load('en.med_ner.ade.clinical_bert') & other such models.

! pip install nlu pyspark==3.0.2
import nlu
nlu.load("en.med_ner.diseases").predict("""I feel a bit drowsy & have a little blurred vision """)

i referred below notebook but error remained the same : https://github.com/JohnSnowLabs/nlu/blob/master/examples/colab/healthcare/medical_named_entity_recognition/overview_medical_entity_recognizers.ipynb

where i am going wrong..?