Localhost iFrame producing warning

I’m loading a local html file (from the assets folder) in an iframe:

<iframe class=‘webPage’ src=“https://localhost/assets/index.html” style=“width:100%; height:100%;”>

When running on android emulator the iframe loads the content - but the debug log shows the following:

index.html:2239 onscript loading complete
index.html:2003 deviceready has not fired after 5 seconds.
index.html:1996 Channel not fired: onFileSystemPathsReady
index.html:2239 onscript loading complete

The /assets/index.html file is a very basic ‘hello world’ html file. I found another post with the same problem:

Their solution:

I simply removed the cordova.js within my iframe and then i access all cordova utils from the parent page using parent.window Hope this may help someone too.

My iframe html doesn’t include any javascript. Is there some way I can resolve this error?