Help migrating from owncloud to nextcloud

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Sorry for the original empty post. This is my first use of this forum.

I am trying to migrate from owncloud to nextcloud and have set up a test system to experiment with. My environment is OpenBSD 6.1 using httpd, with php 5.6 and maria db. I have been able to install nextcloud 11.0.2 and upgrade to 11.0.3. I have also installed owncloud 9.1.4 and upgraded to 9.1.5. My production system is at 9.1.5.

I try to upgrade from owncloud 9.1.5 to nextcloud 10.0.5 using the web and I get an error saying “An error occured”. When I click to see the detailed log, I get a repeat of “an error occured” The log file does show the following error, but that is all.

{“reqId”:“McyEM+hz0iIBTTFSuPQg”,“remoteAddr”:“”,“app”:“index”,“message”:“Exception: {“Exception”:“OC\\NeedsUpdateException”,“Message”:”",“Code”:0,“Trace”:"#0 \/nextcloud\/lib\/private\/legacy\/app.php(123): OC_App::loadApp(‘federation’)\n#1 \/nextcloud\/lib\/base.php(975): OC_App::loadApps(Array)\n#2 \/nextcloud\/index.php(48): OC::handleRequest()\n#3 {main}",“File”:"\/nextcloud\/lib\/private\/legacy\/app.php",“Line”:151}",“level”:3,“time”:“2017-05-26T05:48:35+00:00”,“method”:“GET”,“url”:"/index.php/core/js/oc.js?v=290b6049713cbb89c91a325039a7ee5c",“user”:"–",“version”:“”}

The systems of owncloud and nextcloud that I testing with are the basic installs. No apps are enabled other than what the installations provide.

The config file is:

<?php $CONFIG = array ( 'instanceid' => 'ocovb9lmn6w4', 'passwordsalt' => 'x5ZBSsmI988mpHpX9djfc9ILA0RIZO', 'secret' => '4zkAQ3e01mGBntcn2Da1NgnNAQr3pBkAsnQrGyRQoupDqW3J', 'trusted_domains' => array ( 0 => 'xxxxxxxxxxx', ), 'datadirectory' => '/owncloud/data', 'overwrite.cli.url' => 'https://xxxxxxxx', 'dbtype' => 'mysql', 'version' => '', 'dbname' => 'owncloud', 'dbhost' => 'localhost', 'dbtableprefix' => 'oc_', 'dbuser' => 'owndba', 'dbpassword' => 'dba-pswd', 'logtimezone' => 'UTC', 'installed' => true, 'theme' => '', 'loglevel' => 2, 'maintenance' => false, ); The httpd access log shows: xxxxxxxxxxx - - [25/May/2017:23:15:56 -0700] "GET /index.php HTTP/1.1" 200 0 xxxxxxxxxxx- - [25/May/2017:23:15:56 -0700] "GET /index.php/core/js/oc.js?v=290b6049713cbb89c91a325039a7ee5c HTTP/1.1" 503 0 There is nothing generated in the httpd error log. Can anyone provide a hint as to what to look at next?