Update http-server.md

docs/code-howtos/http-server.md

@@ -7,10 +7,14 @@ parent: Code Howtos
 
 (Based on <https://stackoverflow.com/a/57511038/873282>)
 
-Howto vor Windows - other operating systems work similar:
+Howto for Windows - other operating systems work similar:
 
 1. As admin `choco install mkcert`
 2. As admin: `mkcert -install`
 3. `cd %APPDATA%\..\local\org.jabref\jabref\ssl`
 4. `mkcert -pkcs12 jabref.desktop jabref localhost 127.0.0.1 ::1`
 5. Rename the file to `server.p12`
+
+Note: If you do not do this, you get following error message:
+
+    Could not find server key store C:\Users\USERNAME\AppData\Local\org.jabref\jabref\ssl\server.p12.