Fatal error: Uncaught DropboxException: "apiCall(2\/files\/upload) failed: Error in call to API function \"files\/upload\": Missing or empty HTTP \"Content-Type\" header. Expecting one of \"application\/octet-stream\", \"text\/plain; charset=dropbox-cors-hack\" (URL was https:\/\/content.dropboxapi.com\/2\/files\/upload)" in /homepages/7/d246157196/htdocs/kinostar/filmverleih/wp-content/themes/kinostar-filmverleih/thumbnail-erstellung/dropbox/DropboxClient.php:533 Stack trace: #0 /homepages/7/d246157196/htdocs/kinostar/filmverleih/wp-content/themes/kinostar-filmverleih/thumbnail-erstellung/dropbox/DropboxClient.php(562): DropboxClient->doSingleCall('2/files/upload', Array, true, false) #1 /homepages/7/d246157196/htdocs/kinostar/filmverleih/wp-content/themes/kinostar-filmverleih/thumbnail-erstellung/dropbox/DropboxClient.php(300): DropboxClient->apiCall('2/files/upload', Array, true, false) #2 /homepages/7/d246157196/htdocs/kinostar/filmverleih/wp-content/themes/kinostar-filmverleih/thumbnail-erstellung/dropbox/dropbox_cr in /homepages/7/d246157196/htdocs/kinostar/filmverleih/wp-content/themes/kinostar-filmverleih/thumbnail-erstellung/dropbox/DropboxClient.php on line 533