Trouble with servers stanza

Hi all,

I have an OpenAPI yaml file.  As soon as I add a servers stanza like the following:

servers:
-url: https://xxxxx/renci.org

I can't render the page using swagger-ui anymore.  I'm using this:

npx open-swagger-ui myYAMLFile.yaml

The error in the web console is:

react-dom.production.min.js:216 TypeError: e.get is not a function
at servers.jsx:109:55
at immutable.js:4492:23
at immutable.js:2699:43
at St.__iterate (immutable.js:2206:13)
at qt.__iterate (immutable.js:2698:25)
at qt.findEntry (immutable.js:4491:12)
at qt.find (immutable.js:4375:24)
at p.render (servers.jsx:109:42)
at Hi (react-dom.production.min.js:187:188)
at Wi (react-dom.production.min.js:186:173)

If I comment out the servers stanza it works as expected.

Any thoughts on how to fix this?

Thanks in advance for any help, Apologies if this is the wrong forum for this question.

Howard