User-specified path (source/index.txt,source/libbson.txt,source/libbson/cross-platform-notes.txt,source/libbson/guides.txt,source/libbson/tutorials.txt,source/libmongoc.txt,source/libmongoc/guides.txt,source/libmongoc/guides/in-use-encryption.txt,source/libmongoc/howto.txt,source/libmongoc/ref.txt,source/libmongoc/tutorials.txt,source/libmongoc/tutorials/obtaining-libraries.txt) is invalid; falling back to 'all'.