"TypeError: gitbook.toolbar is undefined" in button.js

[jronallo]

When using this theme I get this error in the console:

TypeError: gitbook.toolbar is undefined[Learn More] buttons.js:70:13
http://localhost:4000/gitbook/gitbook-plugin-sharing/buttons.js:70:13
dispatch http://localhost:4000/gitbook/gitbook.js:2:19267
add/m.handle http://localhost:4000/gitbook/gitbook.js:2:17321
trigger http://localhost:4000/gitbook/gitbook.js:3:8536
trigger/< http://localhost:4000/gitbook/gitbook.js:3:9050
each http://localhost:4000/gitbook/gitbook.js:1:15307
each http://localhost:4000/gitbook/gitbook.js:1:13474
trigger http://localhost:4000/gitbook/gitbook.js:3:9029
r http://localhost:4000/gitbook/gitbook.js:4:8247
http://localhost:4000/preparation/web-server.html:372:5
http://localhost:4000/preparation/web-server.html:371:2

[JasonGao180]

This theme do not have toolbar.