500 error, don´t know what it means

[MisterCutely]

georgehrke told me to open a new issue for my 500 error.
Link to first problem https://github.com/nextcloud/calendar/issues/359
Somebody who can explain me the problem and how i can fix it?

Steps to reproduce

1. Start Nextcloud
2. Open calendar app
3. calender symbol is circling and doesn´t shops the main calendar. Oder calendars were shown.

Expected behaviour

Calendar should be shown with all events

Actual behaviour

Main calendar is not shown. And error in Java console.

Server configuration

Operating system: Don´t know (Hoster is www.all-inkl.com)

Web server: Don´t know (Hoster is www.all-inkl.com)

Database: Myphp

PHP version: 7.1.1

Nextcloud version: 11.0.0

Updated from an older Nextcloud/ownCloud or fresh install: updated

Where did you install Nextcloud from: nextcloud.com

List of activated apps:
Tasks, Mail, contacts,

The content of config/config.php:
original untouched

Are you using external storage, if yes which one: Dropbox

Are you using encryption: no

Client configuration

Browser: Firefox 51.0.1.

Operating system: Windows 7

Logs

Web server error log

`Sabre\VObject\InvalidDataException: Unsupported VALUE parameter for DTEND property. You supplied ""

/www/htdocs/w0086fc8/cloud/3rdparty/sabre/vobject/lib/Parser/MimeDir.php - line 453: Sabre\VObject\Document->createProperty('DTEND', NULL, Array)
/www/htdocs/w0086fc8/cloud/3rdparty/sabre/vobject/lib/Parser/MimeDir.php - line 234: Sabre\VObject\Parser\MimeDir->readProperty('DTEND;TZID=Euro...')
/www/htdocs/w0086fc8/cloud/3rdparty/sabre/vobject/lib/Parser/MimeDir.php - line 217: Sabre\VObject\Parser\MimeDir->parseLine('DTEND;TZID=Euro...')
/www/htdocs/w0086fc8/cloud/3rdparty/sabre/vobject/lib/Parser/MimeDir.php - line 181: Sabre\VObject\Parser\MimeDir->parseLine('BEGIN VEVENT')
/www/htdocs/w0086fc8/cloud/3rdparty/sabre/vobject/lib/Parser/MimeDir.php - line 89: Sabre\VObject\Parser\MimeDir->parseDocument()
/www/htdocs/w0086fc8/cloud/3rdparty/sabre/vobject/lib/Reader.php - line 46: Sabre\VObject\Parser\MimeDir->parse('BEGIN VCALENDAR...', 0)
/www/htdocs/w0086fc8/cloud/3rdparty/sabre/dav/lib/CalDAV/Backend/AbstractBackend.php - line 142: Sabre\VObject\Reader read('BEGIN VCALENDAR...')
/www/htdocs/w0086fc8/cloud/apps/dav/lib/CalDAV/CalDavBackend.php - line 1123: Sabre\CalDAV\Backend\AbstractBackend->validateFilterForObject(Array, Array)
/www/htdocs/w0086fc8/cloud/apps/dav/lib/CalDAV/Calendar.php - line 248: OCA\DAV\CalDAV\CalDavBackend->calendarQuery('2', Array)
/www/htdocs/w0086fc8/cloud/3rdparty/sabre/dav/lib/CalDAV/Plugin.php - line 624: OCA\DAV\CalDAV\Calendar->calendarQuery(Array)
/www/htdocs/w0086fc8/cloud/3rdparty/sabre/dav/lib/CalDAV/Plugin.php - line 250: Sabre\CalDAV\Plugin->calendarQueryReport(Object(Sabre\CalDAV\Xml\Request\CalendarQueryReport))
[internal function] Sabre\CalDAV\Plugin->report('{urn ietf param...', Object(Sabre\CalDAV\Xml\Request\CalendarQueryReport), 'calendars/Benny...')
/www/htdocs/w0086fc8/cloud/3rdparty/sabre/event/lib/EventEmitterTrait.php - line 105: call_user_func_array(Array, Array)
/www/htdocs/w0086fc8/cloud/3rdparty/sabre/dav/lib/DAV/CorePlugin.php - line 718: Sabre\Event\EventEmitter->emit('report', Array)
[internal function] Sabre\DAV\CorePlugin->httpReport(Object(Sabre\HTTP\Request), Object(Sabre\HTTP\Response))
/www/htdocs/w0086fc8/cloud/3rdparty/sabre/event/lib/EventEmitterTrait.php - line 105: call_user_func_array(Array, Array)
/www/htdocs/w0086fc8/cloud/3rdparty/sabre/dav/lib/DAV/Server.php - line 479: Sabre\Event\EventEmitter->emit('method REPORT', Array)
/www/htdocs/w0086fc8/cloud/3rdparty/sabre/dav/lib/DAV/Server.php - line 254: Sabre\DAV\Server->invokeMethod(Object(Sabre\HTTP\Request), Object(Sabre\HTTP\Response))
/www/htdocs/w0086fc8/cloud/apps/dav/lib/Server.php - line 227: Sabre\DAV\Server->exec()
/www/htdocs/w0086fc8/cloud/apps/dav/appinfo/v2/remote.php - line 30: OCA\DAV\Server->exec()
/www/htdocs/w0086fc8/cloud/remote.php - line 165: require_once('/www/htdocs/w00...')
{main}`

Nextcloud log (data/nextcloud.log)

{"reqId":"WNPC2VUNm@kAAFruyrcAAAAI","remoteAddr":"141.113.11.13","app":"PHP","message":"Argument 1 passed to OCA\\Mail\\Model\\IMAPMessage::hordeToAssoc() must be an instance of Horde_Mail_Rfc822_Address, instance of Horde_Mail_Rfc822_Group given, called in \/www\/htdocs\/w0086fc8\/cloud\/apps\/mail\/lib\/Model\/ConvertAddresses.php on line 74 and defined at \/www\/htdocs\/w0086fc8\/cloud\/apps\/mail\/lib\/Model\/ConvertAddresses.php#34","level":3,"time":"2017-03-23T12:43:05+00:00","method":"GET","url":"\/index.php\/apps\/mail\/accounts\/-1\/folders\/YWxsLWluYm94ZXM%3D\/messages?from=0&to=20&filter=","user":"Benny","version":"11.0.0.10"}

Browser log

"Deprecation warning: use moment.updateLocale(localeName, config) to change an existing locale. moment.defineLocale(localeName, config) should only be used for creating a new locale See http://momentjs.com/guides/#/warnings/define-locale/ for more info." moment-with-locales.js:282
NS_BINDING_ABORTED: Component returned failure code: 0x804b0002 (NS_BINDING_ABORTED) [nsIStreamListener.onDataAvailable] WebRequest.jsm:231
Das textContent-Attribut von Attributen sollte nicht mehr verwendet werden. Verwenden Sie value stattdessen. app.min.js:2:4429 /remote.php/dav/calendars/Benny/bennyoccalendar/ 500 app.min.js:2
A promise chain failed to handle a rejection. Did you forget to '.catch', or did you forget to 'return'? See https://developer.mozilla.org/Mozilla/JavaScript_code_modules/Promise.jsm/Promise Date: Fri Mar 17 2017 07:29:31 GMT+0100 Full Message: Error: page-thumbnail:error Full Stack: observe@resource://gre/modules/BackgroundPageThumbs.jsm:116:22 BackgroundPageThumbs._onCaptureOrTimeout@resource://gre/modules/BackgroundPageThumbs.jsm:305:7 Capture.prototype._done/done@resource://gre/modules/BackgroundPageThumbs.jsm:451:7 Capture.prototype._done@resource://gre/modules/BackgroundPageThumbs.jsm:471:7 Capture.prototype.notify@resource://gre/modules/BackgroundPageThumbs.jsm:428:5 BackgroundPageThumbs.jsm:116

[MorrisJobke]

cc @ChristophWurst @georgehrke

[georgehrke]

/remote.php/dav/calendars/Benny/bennyoccalendar/ 500 app.min.js:2

The server is never supposed to die with a 500, but catch broken calendar data imho.
That's why I asked @MisterCutely to report a bug here.

https://github.com/nextcloud/server/blob/master/apps/dav/lib/CalDAV/CalDavBackend.php#L1141
validateFilterForObject will parse the object. So we basically have to add a try-catch here.