Singularity .sif image not found using local.file prefix

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Cluster information:

Kubernetes version: v1.19.3
Cloud being used: bare-metal
Installation method: manual
Host OS: ubuntu 18.04
CNI and version:
CRI and version: singularity-cri 1.13

I labelled the nodes using:
kubectl label no runtime=singularity

apiVersion: apps/v1
kind: Deployment
metadata:
name: testapp
spec:
replicas: 2
selector:
matchLabels:
app: testapp
template:
metadata:
labels:
app: testapp
spec:
nodeSelector:
runtime: singularity
containers:
- name: testapp
image: local.file/local/home/user1/testapp.sif
ports:
- containerPort: 8080


apiVersion: v1
kind: Service
metadata:
name: testapp
spec:
type: NodePort
ports:
- port: 80
targetPort: 8080
selector:
app: testapp

Failed to pull image “local.file/local/home/user1/testapp.sif”: rpc error: code = Internal desc = could not pull image: could not fetch local SIF info: could not open sif image: open /local/home/user1/testapp.sif: no such file or directory.

Thanks.