diff --git a/util/docblox_errorchecker.php b/util/docblox_errorchecker.php
deleted file mode 100644
index a67be69ce..000000000
--- a/util/docblox_errorchecker.php
+++ /dev/null
@@ -1,145 +0,0 @@
-<?php
-/**
- * When I installed docblox, I had the experience that it does not generate any output at all.
- * This script may be used to find that kind of problems with the documentation build process.
- * If docblox generates output, use another approach for debugging.
- *
- * Basically, docblox takes a list of files to build documentation from. This script assumes there is a file or set of files
- * breaking the build when it is included in that list. It tries to calculate the smallest list containing these files.
- * Unfortunatly, the original problem is NP-complete, so what the script does is a best guess only.
- *
- * So it starts with a list of all files in the project.
- * If that list can't be build, it cuts it in two parts and tries both parts independently. If only one of them breaks,
- * it takes that one and tries the same independently. If both break, it assumes this is the smallest set. This assumption
- * is not necessarily true. Maybe the smallest set consists of two files and both of them were in different parts when
- * the list was divided, but by now it is my best guess. To make this assumption better, the list is shuffled after every step.
- *
- * After that, the script tries to remove a file from the list. It tests if the list breaks and if so, it
- * assumes that the file it removed belongs to the set of errorneous files.
- * This is done for all files, so, in the end removing one file leads to a working doc build.
- *
- * @package util
- * @author Alexander Kampmann
- */
-
-/**
- * This function generates a comma seperated list of file names.
- *
- * @package util
- *
- * @param array $fileset Set of file names
- *
- * @return string comma-seperated list of the file names
- */
-function namesList($fileset) {
-	$fsparam="";
-	foreach($fileset as $file) {
-		$fsparam=$fsparam.",".$file;
-	}
-	return $fsparam;
-};
-
-/**
- * This functions runs phpdoc on the provided list of files
- * @package util
- *
- * @param array $fileset Set of filenames
- *
- * @return bool true, if that set can be built
- */
-function runs($fileset) {
-	$fsParam=namesList($fileset);
-	exec('docblox -t phpdoc_out -f '.$fsParam);
-	if(file_exists("phpdoc_out/index.html")) {
-		echo "\n Subset ".$fsParam." is okay. \n";
-		exec('rm -r phpdoc_out');
-		return true;
-	} else {
-		echo "\n Subset ".$fsParam." failed. \n";
-		return false;
-	}
-};
-
-/**
- * This functions cuts down a fileset by removing files until it finally works.
- * it was meant to be recursive, but php's maximum stack size is to small. So it just simulates recursion.
- *
- * In that version, it does not necessarily generate the smallest set, because it may not alter the elements order enough.
- *
- * @package util
- *
- * @param array $fileset set of filenames
- * @param int $ps number of files in subsets
- *
- * @return array a part of $fileset, that crashes
- */
-function reduce($fileset, $ps) {
-	//split array...
-	$parts=array_chunk($fileset, $ps);
-	//filter working subsets...
-	$parts=array_filter($parts, "runs");
-	//melt remaining parts together
-	if(is_array($parts)) {
-		return array_reduce($parts, "array_merge", []);
-	}
-	return [];
-};
-
-//return from util folder to frindica base dir
-$dir='..';
-
-//stack for dirs to search
-$dirstack=[];
-//list of source files
-$filelist=[];
-
-//loop over all files in $dir
-while($dh=opendir($dir)) {
-	while($file=readdir($dh)) {
-		if(is_dir($dir."/".$file)) {
-			//add to directory stack
-			if($file!=".." && $file!=".") {
-				array_push($dirstack, $dir."/".$file);
-				echo "dir ".$dir."/".$file."\n";
-			}
-		} else  {
-			//test if it is a source file and add to filelist
-			if(substr($file, strlen($file)-4)==".php") {
-				array_push($filelist, $dir."/".$file);
-				echo $dir."/".$file."\n";
-			}
-		}
-	}
-	//look at the next dir
-	$dir=array_pop($dirstack);
-}
-
-//check the entire set
-if(runs($filelist)) {
-	echo "I can not detect a problem. \n";
-	exit;
-}
-
-//check half of the set and discard if that half is okay
-$res=$filelist;
-$i=0;
-do {
-	$i=count($res);
-	echo $i."/".count($fileset)." elements remaining. \n";
-	$res=reduce($res, count($res)/2);
-	shuffle($res);
-} while(count($res)<$i);
-
-//check one file after another
-$needed=[];
-
-while(count($res)!=0) {
-	$file=array_pop($res);
-
-	if(runs(array_merge($res, $needed))) {
-		echo "needs: ".$file." and file count ".count($needed);
-		array_push($needed, $file);
-	}
-}
-
-echo "\nSmallest Set is: ".namesList($needed)." with ".count($needed)." files. ";