Conversion of database from SQLite to Mysql under NC14.0.1: no data present

Hi,
my installation of nextcloud ran without problems.

with the following command I converted the database from SQLite to mySQL:
sudo -u apache php occ db:convert-type --all-apps mysql 127.0.0.1
of course and are placeholders.

The conversion started without errors, then

The following tables will not be converted:

oc_dav_properties

oc_files_antivirus

oc_files_avir_status

oc_gpxpod_options_values

oc_gpxpod_tile_servers

oc_gpxpod_tracks

oc_privatedata

oc_reader_bookmarks

oc_reader_preferences

Continue with the conversion (y/n)? [n] yes

continued without errors until


4/4 [============================] 100%oc_users
19/19 [============================] 100%oc_vcategory
4/4 [============================] 100%oc_vcategory_to_object
12/12 [============================] 100%oc_whats_new
0 [>---------------------------]
[prompt]#

Then I logged into nextcloud with user and password which were accepted, but no data is shown, empty page.

When logged in as administrator all users a present, but also no data of administrator.
config.php not detect an error: paths, and other items are correct.

I don’t know where to start searching the error.
Any advice?

Thanx in advance
kormorix

I don’t know where to start searching the error.

Found the reason!
the conversion of the database was NOT the reason, but a security measure which I made a day before.

in https.conf I introduced the line:

Header always set Content-Security-Policy "default-src ‘self’; font-src*;omg-src * data;; script-src *;

which blocked obviously the output into the nextcloud window.