getting exception while calling Dynamo db updateitem

[jamivinaysagar]

Please fill out the sections below to help us address your issue.

What issue did you see ?
getting errored out with boto3.dynamodb.transform.TransformationInjector object at 0x7fd4ad69cd90

Steps to reproduce
If you have a runnable example, please include it as a snippet or link to a repository/gist for larger code examples.
dynamodb = boto3.resource('dynamodb')
table = dynamodb.Table('testing_table')

    response = table.update_item(
        Key={
            'Id': user_id,
            'Timestamp': time_stamp
        },
        UpdateExpression="SET UpdateItem.EventDate=:r",
        ConditionExpression = Attr('EventDate').not_exists(),
        #ConditionExpression = 'attribute_not_exists('EventDate')',

        ExpressionAttributeValues={
            ':r': event_date
        },
        ReturnValues="UPDATED_NEW"
    )

    return response

Debug logs

<bound method TransformationInjector.inject_attribute_value_output of <boto3.dynamodb.transform.TransformationInjector object at 0x7fd4ad69cd90>
Full stack trace by adding boto3.set_stream_logger('') to your code.

[kdaily]

Hi @jamivinaysagar,

I'm not seeing an error message here. can you add your stack trace as noted in the issue template, please? Thanks!

[github-actions]

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