Not Found Lato-BoldItalic.ttf & Lato-BoldItalic.ttf

[pompomcat]

When accessing the document, an error log indicating that Lato - BoldItalic.ttf and Lato - BoldItalic.ttf can not be found in apache error log is output.
When downloading these two files from the following site and storing it, the error disappeared.

Https://github.com/google/fonts/blob/master/ofl/lato/Lato-Italic.ttf
Https://github.com/google/fonts/blob/master/ofl/lato/Lato-BoldItalic.ttf

I am using django+ mod_wsgi
Is this countermeasure wrong?

using version
Sphinx-rtd-theme == 0.2.5 b 1

I'm sorry. My English is not very strong.