After install doiInSummary plugin, error happened in my homepage

Yesterday, I were seraching the internet to find some plugin useful for my journal, I find this one


here: DOI on Table of content page - #10 by abadan

after download and install it in my journal, bad thing happened.

before I installed this plugin, it was look like this:

but after install it, it changed to a sad look, nothing show below the tag

I’ve tried to delete the plugin from the Setup, but it won;t work. Urgently want to know how to solve this knotty problem.

Thank a lot.