Flowable App - Form Issues on starting process

I had published a very basic app through flowable-modeler. And when invoking the app through flowable-task and trying to create a process by clicking the link titled "Start a new process and track its progress", it just keeps on spinning. On checking the network requests, i saw that it throws 404 on trying to hit the below url

`http://:9999/flowable-task/app/rest/process-definitions/sampleapp:1:/start-form`