Não é possível criar novas contas devido ao antigo plugin de campo de usuário multi-select.

[RGJ (Richard - Communiteq)]

[PLUGIN discourse-multiselect-user-field] "model:user-field" was not found by modifyClass

But…

@nathank

@Paul_King

I have a multiselect dropdown feild that was previously set up and working, and set as editable after sign up etc

This plugin has been superceded now as multiselect user custom fields are in core.

EDIT Simon beat me to it