Installing Child Theme

When I try to install a child theme to I get this error message:

The theme “Illdy” generated unexpected PHP debug output.
Click to show/hide PHP debug output

Please contact this Theme’s author and report the items inside the box above. You may or may not be able to use this Theme as a Child Theme while these conditions exist.

It is possible that this theme has specific requirements to work correctly as a child theme. Please make sure you are using the latest version of this theme and check your theme’s documentation for more information.

Is this something that I need to be concerned about before installing my child theme?

Thank you

I figured it out. It was an issue with a plugin.