Hi,
I get this in the verbose listing but the sketch compiles and uploads.
/**
* This source file is under General Public License version 3.
*
* This verision uses a built-in Si5351 library
* Most source code are meant to be understood by the compilers and the computers.
* Code that has to be hackable needs to be well understood and properly documented.
and six more pages all relating to fonts.
Is there anything at the top of those "errors"? (they are not errors, an error would prevent compile from completing) Maybe a #pragma or #warning or something?
It looks to me like a problem with the sketch or library that results in it printing out the license, with each line wrapped in a tag
The first line contains an HTML-escaped \ followed by a *, which if it weren't html-escaped, would turn all that into a multiline comment, implying that it was copied from a webpage with the html markup that turned the comment light grey.