HTTP Task failing

I have created a simple business process in the flowable-modeler which includes an HTTP Task, POST request. However, when the business process is executed, it fails. Below is an extract of some of the error messages I am seeing.

at [?:1.8.0_232]
Caused by: org.flowable.common.engine.impl.javax.el.PropertyNotFoundException: Cannot resolve identifier ‘task’
2020-08-26 09:30:20.820 ERROR 1 — [io-8080-exec-10] o.s.b.w.s.s.ErrorPageFilter : Forwarding to error page from request [/app/rest/task-forms/42375a90-e16d-11ea-a0e0-0242ac110002] due to exception [Exception during command execution]

Caused by: org.flowable.common.engine.impl.javax.el.ELException: Could not resolve function ‘var:get’
at ~[flowable-engine-common-6.5.0.jar:6.5.0]

Can you please share the expression that it is failing? From the information that you have provided it seems like you are trying to use “task” somewhere and there is no variable named like that.