. 500 Internal Server Error

hallo , ich wollte was installieren da kam dieser Fehler

Internal Server Error

Diese Anfrage konnte auf Grund eines .htaccess Konfigurationsfehlers nicht bearbeitet werden.
Die Überprüfung auf Syntaxfehler in der .htaccess-Datei in diesem oder einem übergeordneten Ordner ist erforderlich. 

Dieses steht in der Datei .htaccess drin

Use the front controller as index file. It serves as a fallback solution when

every other rewrite/redirect fails (e.g. in an aliased environment without

mod_rewrite). Additionally, this reduces the matching process for the

start page (path “/”) because otherwise Apache will apply the rewriting rules

to each configured DirectoryIndex file (e.g. index.php, index.html, index.pl).

DirectoryIndex app.php

Disabling MultiViews prevents unwanted negotiation, e.g. “/app” should not resolve

to the front controller “/app.php” but be rewritten to “/app.php/app”.

Options -MultiViews RewriteEngine On
# Determine the RewriteBase automatically and set it as environment variable.
# If you are using Apache aliases to do mass virtual hosting or installed the
# project in a subdirectory, the base path will be prepended to allow proper
# resolution of the app.php file and to redirect to the correct URI. It will
# work in environments without path prefix as well, providing a safe, one-size
# fits all solution. But as you do not need it in this case, you can comment
# the following 2 lines to eliminate the overhead.
RewriteCond %{REQUEST_URI}::$1 ^(/.+)/(.*)::\2$
RewriteRule ^(.*) - [E=BASE:%1]

# Sets the HTTP_AUTHORIZATION header removed by apache
RewriteCond %{HTTP:Authorization} .
RewriteRule .* - [E=HTTP_AUTHORIZATION:%{HTTP:Authorization}]

# Redirect to URI without front controller to prevent duplicate content
# (with and without `/app.php`). Only do this redirect on the initial
# rewrite by Apache and not on subsequent cycles. Otherwise we would get an
# endless redirect loop (request -> rewrite to front controller ->
# redirect -> request -> ...).
# So in case you get a "too many redirects" error or you always get redirected
# to the start page because your Apache does not expose the REDIRECT_STATUS
# environment variable, you have 2 choices:
# - disable this feature by commenting the following 2 lines or
# - use Apache >= 2.3.9 and replace all L flags by END flags and remove the
#   following RewriteCond (best solution)
RewriteRule ^app\.php(/(.*)|$) %{ENV:BASE}/$2 [R=301,L]

# If the requested filename exists, simply serve it.
# We only want to let Apache serve files and not directories.
RewriteCond %{REQUEST_FILENAME} -f
RewriteRule .? - [L]

# Rewrite all other queries to the front controller.
RewriteRule .? %{ENV:BASE}/app.php [L]

<IfModule !mod_rewrite.c>

# When mod_rewrite is not available, we instruct a temporary redirect of
# the start page to the front controller explicitly so that the website
# and the generated links can still be used.
RedirectMatch 302 ^/$ /app.php/
# RedirectTemp cannot be used instead


am besten mal die zitierte Option auskommentieren oder ganz aus der .htaccess-Datei entfernen, dann dürfte die Installation funktionieren. MultiViews ist hier standardmässig aktiviert und führt bei einer erneuten Aktivierung zu einem Fehler.