Fatal Webdav Exception

Hi im getting this error for some files. My suspect is it could be a path that is too long perhaps? Im not sure. And if it is, how do I solve it? Or is it some other problem altogether?

The storage folder is on a mounted NFS drive at /var/ocstore/

99% of files are ok.. just a few files coming up with these errors.

These are the errors reported in the owncloud desktop client
7/23/2016 2:14:21 PM,path1/path2/path3/build/generated/mockable-android-20.jar,                   D:\OwnCloud,Operation canceled
7/23/2016 2:14:21 PM,path1/path2/path3/build/generated/mockable-android-14.jar,                   D:\OwnCloud,Operation canceled
7/23/2016 2:14:21 PM,path1/path2/path3/app/src/user/res/drawable-hdpi/ic_launcher.png,                   D:\OwnCloud,Operation canceled
7/23/2016 2:14:21 PM,path1/path2/path3/app/src/user/java/com/path4/path5/interfaces/ConstantUtil.java,                   D:\OwnCloud,Operation canceled
7/23/2016 2:14:20 PM,path1/path2/path3/app/src/main/res/drawable-v21/ic_menu_camera.xml,                   D:\OwnCloud,Operation canceled
7/23/2016 2:14:20 PM,path1/path2/path3/app/src/main/res/drawable-mdpi/ic_search_white_24dp.png,                   D:\OwnCloud,Operation canceled
7/23/2016 2:14:20 PM,path1/path2/path3/app/src/main/res/drawable-mdpi/ic_more_horiz_black_24dp.png,                   D:\OwnCloud,Operation canceled
7/23/2016 2:14:20 PM,path1/path2/path3/app/src/main/res/drawable-mdpi/ic_menu_check.png,                   
D:\OwnCloud,Operation canceled
7/23/2016 2:14:20 PM,path1/path2/path3/app/src/main/res/drawable-mdpi/ic_launcher.png,                   D:\OwnCloud,Error downloading https://oc.domain.com/remote.php/webdav/path1/path2/path3/app/src/main/res/drawable-mdpi/ic_launcher.png - server replied: Service Unavailable

The error on server side on the other hand is like:

Fatal webdav Exception: {"Message":"HTTP\/1.1 503 Could not open file","Exception":"Sabre\\DAV\\Exception\\ServiceUnavailable","Code":0,"Trace":"#0 \/var\/www\/owncloud\/3rdparty\/sabre\/dav\/lib\/DAV\/CorePlugin.php(83): 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\/owncloud\/3rdparty\/sabre\/event\/lib\/EventEmitterTrait.php(105): call_user_func_array(Array, Array)\n#3 \/var\/www\/owncloud\/3rdparty\/sabre\/dav\/lib\/DAV\/Server.php(459): Sabre\\Event\\EventEmitter->emit('method:GET', Array)\n#4 \/var\/www\/owncloud\/3rdparty\/sabre\/dav\/lib\/DAV\/Server.php(248): Sabre\\DAV\\Server->invokeMethod(Object(Sabre\\HTTP\\Request), Object(Sabre\\HTTP\\Response))\n#5 \/var\/www\/owncloud\/apps\/dav\/appinfo\/v1\/webdav.php(55): Sabre\\DAV\\Server->exec()\n#6 \/var\/www\/owncloud\/remote.php(138): require_once('\/var\/www\/ownclo...')\n#7 {main}","File":"\/var\/www\/owncloud\/apps\/dav\/lib\/connector\/sabre\/file.php","Line":306,"User":"username"} 2016-07-23T06:14:38+00:00

Error PHP fopen(/var/ocstore/username/files/path1/path2/path3/app/src/main/res/drawable-mdpi/ic_launcher.png): failed to open stream: No such file or directory at /var/www/owncloud/lib/private/files/storage/local.php#261 2016-07-23T06:14:38+00:00

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Closing due to the lack of feedback / info.