nginx multiple virtual hosts - error - too much files? - http

Question

We use nginx for Hosting multiple hosts.
We have haves mixes, some sites are only available at http:// and other sites are able with https://
We create a new config-file for every virtual hosts (domain) if there is a new customer with a new Homepage.
All works correctly.
Today we create 2 new config-files on the nginx, copy the file to sites-enabled and make a nginx reload.
Now, no sites works again.
In the Browser we get the error that the Site is not available.
In the nginx error.log we get the message
*2948... no "ssl_certificate" is defined in server listening on SSL port while SSL handshaking, client: 178...., server 0.0.0.0:443
The Virtual-Host config File we create look like:
server {
listen 80;
server_name example.de;
return 301 http://www.$http_host$request_uri;
}
server {
listen 80;
server_name *.example.de;
location / {
access_log off;
proxy_pass http://example.test.de;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwareded-For $proxy_add_x_forwarded_for;
proxy_http_version 1.1;
proxy_set_header Upgrade $http_upgrade;
proxy_sestheader Connection "upgrade";
}
}
We get the error only if we create a new virtual-host file in the sites-enabled. if we copy the code into a exisiting virtual host file it works correctly and all other sites works again.
Any Ideas why it doesn't work if we create a new file?
We deleted the new file, create it again but always get the same effect with the error Message in the error-log file.
I don't know if its important but we have 196 Files in the sites-enabled directory. If we create a new one the error come again, if we delete the file and write the code into a existing file it works correctly?!
We don't think that is a ssl error, we think that the count of files are the problem?!
We want to create always a new virtual-host config-file for each customer and don't edit add the config to a existing file.