@julian @baris It works! Thanks so much for the help!

@PitaJ I disabled all the plugins and rebuilt the forum, but I still got the same error code.

I met just same probelm too when I try to install nodebb last day. I can upload favicon but can't upload any other images. I used the same centos7 and v12.15.0 node.js. I looked up the installation log, it shows some modules did not installed well. For me it were sharp and some other modules. I guess it's the sharp module which is used to crop the images uploaded caused this problem. Sharp module need 'CXXABI_1.3.8' to compile and my default yum source did not have the gcc version needed. Maybe you can upgrade your gcc version and try reinstalling it by using "npm install sharp"? Hope this can help.

Hello, I installed NodeBB with Docker . All other functions works fine, but when I want to register a new user, after I enter my registration information and click submit button, it went wrong and shows:

Internal Error. 
Oops! Looks like something went wrong!
/register/complete/
Invalid Data

Here's the error log:

2020-02-11T12:27:59.776Z [4567/130] - error: /register/complete/
[[error:invalid-data]] {"stack":"Error: [[error:invalid-data]]
at Object.plugins.registerHook.method (/usr/src/app/src/user/index.js:239:36)
at /usr/src/app/src/plugins/hooks.js:121:29
at /usr/src/app/node_modules/async/dist/async.js:1636:13
at replenish (/usr/src/app/node_modules/async/dist/async.js:445:21)
at /usr/src/app/node_modules/async/dist/async.js:450:13
at eachOfLimit$1 (/usr/src/app/node_modules/async/dist/async.js:476:34)
at awaitable(eachOfLimit$1) (/usr/src/app/node_modules/async/dist/async.js:208:32)
at eachOfSeries (/usr/src/app/node_modules/async/dist/async.js:663:16)
at awaitable(eachOfSeries) (/usr/src/app/node_modules/async/dist/async.js:208:32)
at Object.reduce (/usr/src/app/node_modules/async/dist/async.js:1635:16)"}

But I can add and delete users using admin border. And I can also login to the users I created. How can I solve this problem?
Thanks!