I tried to build it again, yes, once I install nodebb-solr by the following command, and active it in the ACP, then I cannot open /admin page.
npm install nodebb-plugin-solr
as soon as I remove it by
npm uninstall nodebb-plugin-solr
I can open ACP page. I am using nodebb v1.18.6. I find this solr plugin was updated recently from 5,3,0 to 5.3.1, I think maybe there is a bug?
Alright, right now I use the following to fix it:
npm install [email protected]
Now it works.