My local.properties file in Android Studio 3.0 shows in red but no errors?

[Lisa Austin]

I'm learning Android development and a project which was running fine previously won't run anymore.  It's a simple Quiz app where you select the correct checkbox or radio button as an answer and it gives you a Toast message.

I noticed the project's local.properties file name ( the actual name "properties.file") shows up in red and not white like other properties files ( gradle.properties name is white)  but I do not see any errors in my log and there isn't any compile type errors coming up.
I created a new project and compared the two project's SDK location and file contents and they seem to be the same.  The SDK location from File > Settings > System Settings > Android SDK .
I attached a screen shot of the two projects to hopefully better explain myself.

Can anyone tell me why one project's local.properties file is red ?