Upload of png or svg files - MediaWiki-l

3 Jan 2019

Hello, when I try to upload a png or svg file I get this error:

Exception encountered, of type "LocalFileLockError"

[XC4uL4ZffggAACRtm4QAAAAC] /wiki/Spezial:Hochladen LocalFileLockError  
from line 1930 of  
/afs/.rrz.uni-koeln.de/vol/www/projekt/sarazenen/http/docs/wiki/includes/filerepo/file/LocalFile.php:
Could not acquire lock for  
'330px-Variable_Resistor.png.'

Backtrace:

#0  
/afs/.rrz.uni-koeln.de/vol/www/projekt/sarazenen/http/docs/wiki/includes/filerepo/file/LocalFile.php(1165):

LocalFile->lock()

#1  
/afs/.rrz.uni-koeln.de/vol/www/projekt/sarazenen/http/docs/wiki/includes/upload/UploadBase.php(729):
LocalFile->upload(string, string, string, integer, array, boolean, User,  
array)

#2  
/afs/.rrz.uni-koeln.de/vol/www/projekt/sarazenen/http/docs/wiki/includes/specials/SpecialUpload.php(537):
UploadBase->performUpload(string, string, boolean, User,  
array)

#3  
/afs/.rrz.uni-koeln.de/vol/www/projekt/sarazenen/http/docs/wiki/includes/specials/SpecialUpload.php(206):

SpecialUpload->processUpload()

#4  
/afs/.rrz.uni-koeln.de/vol/www/projekt/sarazenen/http/docs/wiki/includes/specialpage/SpecialPage.php(479):

SpecialUpload->execute(NULL)

#5  
/afs/.rrz.uni-koeln.de/vol/www/projekt/sarazenen/http/docs/wiki/includes/specialpage/SpecialPageFactory.php(577):

SpecialPage->run(NULL)

#6  
/afs/.rrz.uni-koeln.de/vol/www/projekt/sarazenen/http/docs/wiki/includes/MediaWiki.php(282):
SpecialPageFactory::executePath(Title,  
RequestContext)

#7  
/afs/.rrz.uni-koeln.de/vol/www/projekt/sarazenen/http/docs/wiki/includes/MediaWiki.php(735):

MediaWiki->performRequest()

#8  
/afs/.rrz.uni-koeln.de/vol/www/projekt/sarazenen/http/docs/wiki/includes/MediaWiki.php(509):

MediaWiki->main()

#9  
/afs/.rrz.uni-koeln.de/vol/www/projekt/sarazenen/http/docs/wiki/index.php(43):  
MediaWiki->run()

#10 {main}

What is the problem here?

Many Greetings,
Adalbert Wrona