Process Modeling 101: Automate Your Business Processes build an application step 10.

Hi,

I am getting the following error "Could not display interface. Please check definition and inputs. Interface Definition: Expression evaluation error at function a!sectionLayout [line 4]: The contents field on a column layout cannot contain a form layout. Received a form layout at index 1." when trying to complete the instructions on page 4 of Build an application step 10 of the process modeling 101 course. 

See expression below.

a!formLayout(
label: "New Maintenance Request",
contents: {
a!sectionLayout(
label: "Vehicle Details",
contents: {rule!AX_VehicleDetailsView(ri!vehicle)
}
),
a!sectionLayout(
label: "Section",
contents: {}
)
},
buttons: a!buttonLayout(
primaryButtons: {
a!buttonWidget(
label: "Submit",
submit: true,
style: "SOLID"
)
},
secondaryButtons: {
a!buttonWidget(
label: "Cancel",
value: true,
saveInto: ri!cancel,
submit: true,
style: "OUTLINE",
validate: false
)
}
)
)