Error while downloading file

{“reqId”:“DUJzaRr3I5s0oxoWkc3d”,“level”:4,“time”:“2018-07-27T12:14:49+00:00”,“remoteAddr”:“20**:::::::",“user”:“k*******”,“app”:“webdav”,“method”:“GET”,“url”:"/remote.php/webdav/Videos/Trailer/Scarface/scarface-trailer.mp4?downloadStartSecret=9yovxr1uac7",“message”:“Exception: {“Exception”:“Sabre\\DAV\\Exception\\ServiceUnavailable”,“Message”:“Could not open file”,“Code”:0,“Trace”:”#0 \/var\/www\/vhosts\/.de\/.de\/3rdparty\/sabre\/dav\/lib\/DAV\/CorePlugin.php(88): OCA\\DAV\\Connector\\Sabre\\File->get()\n#1 [internal function]: Sabre\\DAV\\CorePlugin->httpGet(Object(Sabre\\HTTP\\Request), Object(Sabre\\HTTP\\Response))\n#2 \/var\/www\/vhosts\/.de\/.de\/3rdparty\/sabre\/event\/lib\/EventEmitterTrait.php(105): call_user_func_array(Array, Array)\n#3 \/var\/www\/vhosts\/.de\/.de\/3rdparty\/sabre\/dav\/lib\/DAV\/Server.php(479): Sabre\\Event\\EventEmitter->emit(‘method:GET’, Array)\n#4 \/var\/www\/vhosts\/.de\/.de\/3rdparty\/sabre\/dav\/lib\/DAV\/Server.php(254): Sabre\\DAV\\Server->invokeMethod(Object(Sabre\\HTTP\\Request), Object(Sabre\\HTTP\\Response))\n#5 \/var\/www\/vhosts\/.de\/.de\/apps\/dav\/appinfo\/v1\/webdav.php(80): Sabre\\DAV\\Server->exec()\n#6 \/var\/www\/vhosts\/.de\/.de\/remote.php(164): require_once(’\/var\/www\/vhosts…’)\n#7 {main}",“File”:"\/var\/www\/vhosts\/.de\/*.de\/apps\/dav\/lib\/Connector\/Sabre\/File.php”,“Line”:337}",“userAgent”:“Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36”,“version”:“13.0.4.0”}

How can i fix this?