[Python] "The provided key element does not match the schema" error when getting an item from...

This is the table partition key setting

The table content

When I tried to get an item from the table, it prints this error

botocore.exceptions.ClientError: An error occurred (ValidationException) when calling the GetItem operation: The provided key element does not match the schema
​

This is my code

dynamodb = boto3.resource('dynamodb')
table = dynamodb.Table('testDynamodb')
response = table.get_item(Key={'userId': "user2873"})
item = response['Item']
print(item)


Any ideas? thanks.

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