CDK for setting ALB controller in EKS UPGRADE FAILED: another operation

I have an application that needs to be deployed on EKS, and I'm having trouble setting up an ingress ALB.

I am using the following as a sample for how this should be set up. https://github.com/aws-samples/nexus-oss-on-aws/blob/d3a092d72041b65ca1c09d174818b513594d3e11/src/lib/sonatype-nexus3-stack.ts#L207-L242

It's in TypeScript and I'm converting it to Python. My code is as below.

from aws_cdk import (
    Stack,
    aws_eks as eks,
    aws_ec2 as ec2,
    aws_iam as iam,
    Duration
)
from constructs import Construct

class TestStack(Stack):

    def __init__(self, scope: Construct, construct_id: str, **kwargs) -> None:
        super().__init__(scope, construct_id, **kwargs)

        vpc = ec2.Vpc(self, "test-vpc",
            vpc_name="test-vpc",
            cidr="10.0.0.0/16"
        )

        eks_role = iam.Role(
            self, 'test-eks-role',
            role_name = 'test-eks-role',
            assumed_by=iam.CompositePrincipal(
                iam.ServicePrincipal('eks.amazonaws.com')
            ),
            managed_policies=[iam.ManagedPolicy.from_aws_managed_policy_name('AmazonEKSClusterPolicy')],
        )

        cluster = eks.Cluster(
            self, "test-cluster",
            cluster_name="test-cluster",
            masters_role=eks_role,
            version=eks.KubernetesVersion.V1_21,
            vpc=vpc,
            vpc_subnets=[ec2.SubnetSelection(subnet_type=ec2.SubnetType.PRIVATE_WITH_NAT)]
        )
        
        alb_service_account = cluster.add_service_account(
            'test-cluster-service-account',
            name='test-cluster-service-account'
        )

        import requests

        alb_controller_url = 'https://raw.githubusercontent.com/kubernetes-sigs/aws-load-balancer-controller/v2.2.0/docs/install/iam_policy.json'
        policy_json = requests.get(url=alb_controller_url).json()

        for statement in policy_json['Statement']:
            alb_service_account.add_to_principal_policy(iam.PolicyStatement.from_json(statement))

        cluster.add_helm_chart(
            'aws-load-balancer-controller-helm-chart',
            chart='aws-load-balancer-controller',
            repository='https://aws.github.io/eks-charts',
            release='aws-load-balancer-controller',
            version='1.4.1',
            wait=True,
            timeout=Duration.minutes(15),
            values={
                "clusterName": cluster.cluster_name,
                "image": {
                    "repository": "602401143452.dkr.ecr.ap-southeast-2.amazonaws.com/amazon/aws-load-balancer-controller:v2.4.1",
                },
                "serviceAccount": {
                    "create": False,
                    "name": alb_service_account.service_account_name,
                },
            },
        )

Right now I'm getting the following cryptic error message.

Received response status [FAILED] from custom resource. Message returned: Error: b'Error: UPGRADE FAILED: another operation (i
nstall/upgrade/rollback) is in progress\n'

Any advice would be greatly appreciated!