Holding any bag of any tier and do CTRL+Right-Click to toggle between modes

It did tell me in chat that it toggled fine, but an error was generated in server console:
https://gist.github.com/FiveEYZ/b1779e28b772eeb0b50587de94adc1f2

Using:
Bagginses-1.10.2-3.0.4a
forge-1.10.2-12.18.1.2073-universal