Font error during theme change

[johnbritto1]

Hello,

I have installed butterfly using.
pip install butterfly
pip install butterfly[themes]

started butterfly.server.py as

butterfly.server.py --host=192.168.0.129 --port=57575 --login --pam_profile=sshd --unsecure

The output
[W 190510 15:01:41 butterfly.server:384] Butterfly is ready, open your browser to: http://192.168.0.129:57575/
[W 190510 15:01:47 web:2162] 404 GET /theme/built-in-color-solarized-dark/fonts/SourceCodePro-Regular.otf (192.168.0.100) 0.61ms
[W 190510 15:01:47 web:2162] 404 GET /theme/built-in-color-solarized-dark/fonts/SourceCodePro-Bold.otf (192.168.0.100) 0.42ms
[W 190510 15:02:01 web:2162] 404 GET /theme/built-in-color-solarized-dark/fonts/SourceCodePro-Black.otf (192.168.0.100) 0.55ms
[W 190510 15:02:04 web:2162] 404 GET /theme/built-in-color-solarized-dark/fonts/SourceCodePro-Regular.otf (192.168.0.100) 0.63ms
[W 190510 15:02:04 web:2162] 404 GET /theme/built-in-color-solarized-dark/fonts/SourceCodePro-Bold.otf (192.168.0.100) 0.42ms