[horde] Ubuntu 16.04LTS PHP 7.0 Classe System and Net_DNS2_Cache_File not found

[InsertDisk2]

Hi,

I have installed Horde from the Ubuntu sources on my Ubuntu server. 
However, calling test. php will cause the following error:

HORDE[32660]: [horde] Error: Class 'System' not found in
/usr/share/horde/lib/Test.php:705
Stack trace:
#0 /usr/share/horde/test.php(206): Horde_Test->requiredFileCheck()
#1 {main} [pid 32660 on line 74 of "/usr/share/php/Horde/ErrorHandler.php"]

When trying to login, this error is displayed:

HORDE[32658]: Error: Class 'Net_DNS2_Cache_File' not found in
/usr/share/php/Net/DNS2.php:317
Stack trace:
#0 /usr/share/php/Net/DNS2/Resolver.php(75): Net_DNS2->__construct(Array)
#1 /usr/share/php/Horde/Core/Factory/Dns.php(24):
Net_DNS2_Resolver->__construct(Array)
#2 /usr/share/php/Horde/Injector/Binder/Factory.php(119):
Horde_Core_Factory_Dns->create(Object(Horde_Injector))
#3 /usr/share/php/Horde/Injector.php(238):
Horde_Injector_Binder_Factory->create(Object(Horde_Injector))
#4 /usr/share/php/Horde/Injector.php(272):
Horde_Injector->createInstance('Net_DNS2_Resolv...')
#5 /usr/share/php/Horde/Registry.php(2510):
Horde_Injector->getInstance('Net_DNS2_Resolv...')
#6 /usr/share/php/Horde/Registry.php(2585): Horde_Registry->remoteHost()
#7 /usr/share/php/Horde/Core/Auth/Application.php(658):
Horde_Registry->setAuth('r.muller', Array, Array)
#8 /usr/share/php/Horde/Core/Auth/Application.php(150):
Horde_Core_Auth_Application->_setAuth()
#9 /usr/share/php/Horde/Dav/Auth.php(54):
Horde_Core_Auth_Application->authenticate('r.muller', Array)
#10 /usr/share/php/Sabre/DAV/Auth/Backend/AbstractBasic.php(77):
Horde_Dav_Auth->validateUserPass('r.muller', 'geheim')
#11 /usr/share/php/Sabre/DAV/Auth/Plugin.php(108):
Sabre\DAV\Auth\Backend\AbstractBasic->authenticate(Object(Sabre\DAV\Server),
'Horde DAV Serve...')
#12 [internal function]: Sabre\DAV\Auth\Plugin->beforeMethod('PROPFIND',
'calendars/r.mul...')
#13 /usr/share/php/Sabre/DAV/Server.php(433): call_user_func_array(Array,
Array)
#14 /usr/share/php/Sabre/DAV/Server.php(455):
Sabre\DAV\Server->broadcastEvent('beforeMethod', Array)
#15 /usr/share/php/Sabre/DAV/Server.php(214):
Sabre\DAV\Server->invokeMethod('PROPFIND', 'calendars/r.mul...')
#16 /usr/share/php/Horde/Rpc/Webdav.php(66): Sabre\DAV\Server->exec()
#17 /usr/share/horde/rpc.php(160): Horde_Rpc_Webdav->getResponse('')
#18 {main} [pid 32658 on line 74 of "/usr/share/php/Horde/ErrorHandler.php"]

what's wrong? Please help.




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