Error 500 Message Failed to start container | Arkit

I was trying to launch an application using ShinyProxy, however, when clicking a particular application it shows an error message as below the error message

Error
Status code: 500

Message: Failed to start container

Stack Trace: 
eu.openanalytics.containerproxy.ContainerProxyException: Failed to start the container

above error message state that Shinyproxy was unable to start the particular container you clicked.

# cat /lib/systemd/system/docker.service
[Unit]
Description=Docker Application Container Engine
Documentation=https://docs.docker.com
After=network-online.target firewalld.service containerd.service
Wants=network-online.target
Requires=docker.socket containerd.service

[Service]
Type=notify
# the default is not to use systemd for cgroups because the delegate issues still
# exists and systemd currently does not support the cgroup feature set required
# for containers run by docker
ExecStart=/usr/bin/dockerd -H unix:// -D -H tcp://127.0.0.1:2375]\