Toolbar disappears when I use addthis.layers() initial paramater

Hello,
I am trying to customize which share buttons appear on the toolbar. I followed the instructions and put this code into the addthis.layers() initial paramater field in the “advanced options” menu:

{ "share": { "services": "facebook,twitter,googleplus,linkedin,more" } }

When I have that code in there, the toolbar doesn’t appear on the front end.

https://www.ads-software.com/plugins/addthis/