NGINX restarts fails every time after adding a second virtual host - nginx

Question

I dont know what i am doing wrong.
First I tried to add Vhosts in NGINX making new file in sites-available then linken to sites-enabled. This doerst work.
Then I tried to make the vhosts directly in the nginx.conf file. There is the same Problem. It works perfectly for one host but then if I add a another one and try to /etc/init.d/nginx start it always says:
See "systemctl status nginx.service" and "journalctl -xe" for details.
failed!
How can I fix that?
Here ist my nginx.conf
user www-data;
worker_processes auto;
pid /run/nginx.pid;
include /etc/nginx/modules-enabled/*.conf;
events {
worker_connections 768;
# multi_accept on;
}
http {
server_names_hash_bucket_size 64;
##
# Basic Settings
##
sendfile on;
tcp_nopush on;
tcp_nodelay on;
keepalive_timeout 65;
types_hash_max_size 2048;
# server_tokens off;
# server_names_hash_bucket_size 64;
# server_name_in_redirect off;
include /etc/nginx/mime.types;
default_type application/octet-stream;
##
# SSL Settings
##
ssl_protocols TLSv1 TLSv1.1 TLSv1.2; # Dropping SSLv3, ref: POODLE
ssl_prefer_server_ciphers on;
##
# Logging Settings
##
access_log /var/log/nginx/access.log;
error_log /var/log/nginx/error.log;
##
# Gzip Settings
##
gzip on;
gzip_disable "msie6";
# gzip_vary on;
# gzip_proxied any;
# gzip_comp_level 6;
# gzip_buffers 16 8k;
# gzip_http_version 1.1;
# gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript;
##
# Virtual Host Configs
##
server {
listen 80 default_server;
listen [::]:80 default_server;
server_name_;
location / {
root /var/www/html/;
index index.html index.htm index.nginx-debian.html;
autoindex on;
}
location ~ \.php$ {
root /var/www/html/;
include snippets/fastcgi-php.conf;
fastcgi_pass unix:/var/run/php/php7.0-fpm.sock;
}
}
server {
listen 80;
server_name website.de;
location / {
root /var/www/dev1/;
index index.html index.htm;
autoindex on;
}
location ~ \.php$ {
root /var/www/dev1/;
include snippets/fastcgi-php.conf;
fastcgi_pass unix:/var/run/php/php7.0-fpm.sock;
}
}
}