Imports do not appear to be finding functions

We are attempting to convert an old flex app to royale. We have the newest nightly build however there are still build errors which seem to indicate either we are not accessing the right directories or have something set wrong. Examples of errors.
Type was not found or was not a compile-time constant: URLRequest.
:
: var u:URLRequest = new URLRequest("http

Error: Call to a possibly undefined method navigateToURL.
:
: navigateToURL(u,"_blank");

Newer to this type of software so some guidance is appreciated.

Start by reproducing the reported build with the newest nightly build and inspect how the project resolves imports and source directories. Use the URLRequest and navigateToURL errors as the initial checks; done means the relevant imports resolve and these build errors no longer occur.

Written by the indexing model from the issue text.