Unable to enable news on owncloud 9.1

[theScrabi]

IMPORTANT

Read and tick the following checkbox after you have created the issue or place an x inside the brackets ;)

• [x] I have read the CONTRIBUTING.md and followed the provided tips

  Explain the Problem

What problem did you encounter? Enable the app, but after reload app is disabled again.

Steps to Reproduce

Explain what you did to encounter the issue

1. Go to not active apps
2. enable news
3. reload page

   System Information

   • News app version: 8.8.0
   • ownCloud version: 9.1.0.15
   • PHP version: 7.0.8
   • Database and version: mysql 5.7.13
   • Browser and version: firefox
   • Distribution and version: ubuntu 16.04 aarch64

     Contents of owncloud/data/owncloud.log

{"reqId":"6NRytvg5sb2dV0ZT05rb","remoteAddr":"188.194.240.199","app":"no app in context","message":"Exception: {\"Exception\":\"Error\",\"Message\":\"Class '\\\\OCP\\\\Backgroundjob' not found\",\"Code\":0,\"Trace\":\"#0 \\\/var\\\/www\\\/owncloud\\\/apps\\\/news\\\/appinfo\\\/application.php(243): OCA\\\\News\\\\Config\\\\AppConfig->registerAll()\\n#1 \\\/var\\\/www\\\/owncloud\\\/apps\\\/news\\\/appinfo\\\/app.php(18): OCA\\\\News\\\\AppInfo\\\\Application->registerConfig()\\n#2 \\\/var\\\/www\\\/owncloud\\\/lib\\\/private\\\/legacy\\\/app.php(186): require_once('\\\/var\\\/www\\\/ownclo...')\\n#3 \\\/var\\\/www\\\/owncloud\\\/lib\\\/private\\\/legacy\\\/app.php(149): OC_App::requireAppFile('news')\\n#4 \\\/var\\\/www\\\/owncloud\\\/lib\\\/private\\\/legacy\\\/app.php(119): OC_App::loadApp('news')\\n#5 \\\/var\\\/www\\\/owncloud\\\/lib\\\/base.php(875): OC_App::loadApps()\\n#6 \\\/var\\\/www\\\/owncloud\\\/index.php(39): OC::handleRequest()\\n#7 {main}\",\"File\":\"\\\/var\\\/www\\\/owncloud\\\/apps\\\/news\\\/config\\\/appconfig.php\",\"Line\":88}","level":3,"time":"2016-07-22T15:27:55+00:00","method":"GET","url":"\/owncloud\/index.php\/apps\/files","user":"admin"}
{"reqId":"ha+KezzrF\/kcWpRq7W\/X","remoteAddr":"188.194.240.199","app":"core","message":"No update found at the ownCloud appstore for app 166055","level":0,"time":"2016-07-22T15:28:04+00:00","method":"GET","url":"\/owncloud\/index.php\/settings\/apps\/list?category=disabled&includeUpdateInfo=1","user":"admin"}
{"reqId":"ha+KezzrF\/kcWpRq7W\/X","remoteAddr":"188.194.240.199","app":"core","message":"No update found at the ownCloud appstore for app 166049","level":0,"time":"2016-07-22T15:28:08+00:00","method":"GET","url":"\/owncloud\/index.php\/settings\/apps\/list?category=disabled&includeUpdateInfo=1","user":"admin"}
{"reqId":"ha+KezzrF\/kcWpRq7W\/X","remoteAddr":"188.194.240.199","app":"core","message":"No update found at the ownCloud appstore for app 166051","level":0,"time":"2016-07-22T15:28:08+00:00","method":"GET","url":"\/owncloud\/index.php\/settings\/apps\/list?category=disabled&includeUpdateInfo=1","user":"admin"}

[Gerii]

Duplicate of #1008 Apply https://github.com/owncloud/news/issues/1008#issuecomment-234258808 to fix this issue.