Mail app not working in RC 10?

All requests’ result are 200, note that I am using HTTP2.
And the localStorage.clear() is returning undefined.

I have an Error in the console while loading:
Error: An "el" #mail-new-message-fixed must exist in DOM in mail.min.js:150:0

So, you’re saying it works fine from scratch and my close-to-be-perfect solution was to clean everything (please don’t do that if you don’t know what you’re doing)

- disable Mail
- uninstall Mail
> DELETE FROM oc_appconfig WHERE appid='mail';
> DROP TABLE oc_mail_accounts, oc_mail_collected_addresses;
- enable/install Mail

and it worked.
The value of ‘installed_version’ in oc_appconfig was 0 before I cleaned the value appid=‘mail’. I checked in my dump from 9.0.53 and it was already 0 there. It is now 0.5.2 (the others value are the same before and after the reinstallation of the Mail). Also I tried to put the value of ‘installed_version’ to 0 and the Mail apps was still working.

Also, I don’t have the JS error anymore.