I'm getting Internal Server Error While Opening Or Downloading Files

I’m using Nextcloud 12 and am facing an issue where all my users are getting 500 internal server error when they try and open or download any of their files or shared files.

Here’s an excerpt from our logs:

{“reqId”:“Vca67YdjMPIoS7ItpxaW”,“level”:3,“time”:“September 26, 2017 10:42:42”,“remoteAddr”:“115.186.145.199”,“user”:“qais”,“app”:“remote”,“method”:“GET”,“url”:"/remote.php/webdav/Service%20and%20Support/StoneFly/Video%20Training%20/Partner-setup.mp4",“message”:“Exception: {“Exception”:“Error”,“Message”:“Cannot access private property OC\\Files\\Storage\\Wrapper\\Encryption::$mountPoint”,“Code”:0,“Trace”:”#0 \/var\/www\/html\/apps\/files_accesscontrol\/lib\/Operation.php(56): OCA\\FilesAccessControl\\Operation->isBlockablePath(Object(OC\\Files\\Storage\\Wrapper\\Encryption), ‘__groupfolders\/…’)\n#1 \/var\/www\/html\/apps\/files_accesscontrol\/lib\/CacheWrapper.php(63): OCA\\FilesAccessControl\\Operation->checkFileAccess(Object(OC\\Files\\Storage\\Wrapper\\Encryption), ‘__groupfolders\/…’)\n#2 \/var\/www\/html\/lib\/private\/Files\/Cache\/Wrapper\/CacheWrapper.php(72): OCA\\FilesAccessControl\\CacheWrapper->formatCacheEntry(Object(OC\\Files\\Cache\\CacheEntry))\n#3 \/var\/www\/html\/lib\/private\/Files\/Cache\/Wrapper\/CacheWrapper.php(70): OC\\Files\\Cache\\Wrapper\\CacheWrapper->get(’__groupfolders\/…’)\n#4 \/var\/www\/html\/lib\/private\/Files\/Cache\/Wrapper\/CacheJail.php(103): OC\\Files\\Cache\\Wrapper\\CacheWrapper->get(’__groupfolders\/…’)\n#5 \/var\/www\/html\/lib\/private\/Files\/Cache\/Wrapper\/CacheWrapper.php(70): OC\\Files\\Cache\\Wrapper\\CacheJail->get(’__groupfolders\/…’)\n#6 \/var\/www\/html\/lib\/private\/Files\/Storage\/Wrapper\/Encryption.php(929): OC\\Files\\Cache\\Wrapper\\CacheWrapper->get(‘StoneFly\/Video …’)\n#7 \/var\/www\/html\/lib\/private\/Files\/Storage\/Wrapper\/Encryption.php(379): OC\\Files\\Storage\\Wrapper\\Encryption->getHeader(‘StoneFly\/Video …’)\n#8 \/var\/www\/html\/lib\/private\/Files\/Storage\/Wrapper\/Wrapper.php(294): OC\\Files\\Storage\\Wrapper\\Encryption->fopen(‘StoneFly\/Video …’, ‘r’)\n#9 \/var\/www\/html\/apps\/files_accesscontrol\/lib\/StorageWrapper.php(308): OC\\Files\\Storage\\Wrapper\\Wrapper->fopen(‘StoneFly\/Video …’, ‘r’)\n#10 \/var\/www\/html\/lib\/private\/Files\/View.php(1134): OCA\\FilesAccessControl\\StorageWrapper->fopen(‘StoneFly\/Video …’, ‘r’)\n#11 \/var\/www\/html\/lib\/private\/Files\/View.php(975): OC\\Files\\View->basicOperation(‘fopen’, ‘\/Service and Su…’, Array, ‘r’)\n#12 \/var\/www\/html\/apps\/dav\/lib\/Connector\/Sabre\/File.php(315): OC\\Files\\View->fopen(‘Service and Sup…’, ‘r’)\n#13 \/var\/www\/html\/3rdparty\/sabre\/dav\/lib\/DAV\/CorePlugin.php(85): OCA\\DAV\\Connector\\Sabre\\File->get()\n#14 [internal function]: Sabre\\DAV\\CorePlugin->httpGet(Object(Sabre\\HTTP\\Request), Object(Sabre\\HTTP\\Response))\n#15 \/var\/www\/html\/3rdparty\/sabre\/event\/lib\/EventEmitterTrait.php(105): call_user_func_array(Array, Array)\n#16 \/var\/www\/html\/3rdparty\/sabre\/dav\/lib\/DAV\/Server.php(479): Sabre\\Event\\EventEmitter->emit(‘method:GET’, Array)\n#17 \/var\/www\/html\/3rdparty\/sabre\/dav\/lib\/DAV\/Server.php(254): Sabre\\DAV\\Server->invokeMethod(Object(Sabre\\HTTP\\Request), Object(Sabre\\HTTP\\Response))\n#18 \/var\/www\/html\/apps\/dav\/appinfo\/v1\/webdav.php(71): Sabre\\DAV\\Server->exec()\n#19 \/var\/www\/html\/remote.php(162): require_once(’\/var\/www\/html\/a…’)\n#20 {main}",“File”:"\/var\/www\/html\/apps\/files_accesscontrol\/lib\/Operation.php",“Line”:85}",“userAgent”:“Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36”,“version”:“12.0.2.0”}

Please advise what I can do to solve this issue, it’s quite pressing and has become a show stopper for us.

Thank you.

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