Update README.md

README.md

@@ -13,6 +13,7 @@ Grasscutter launcher for easily switching between Official and Private servers
 * [Common Problems](#having-problems)
   * [White Screen Fix](#white-screen-fix)
   * [Error 502](#error-502)
+  * [Error 4206](#error-4206)
   * [Infinite CMD Windows](#infinite-cmd-windows)
   * [Broken Discord/Youtube](#my-discord-is-not-letting-me-send-messages-or-load-images-my-youtube-is-acting-strange)
   * [No internet](#i-have-no-internet-after-closing-everything-restarting-my-pc)
@@ -88,6 +89,10 @@ If you are still getting an error 502 when attempting to log in to your own serv
 ```
 where `YOUR_PORT` is the same port you use as the `Port` value already. This will probably be 443.
 
+## Error 4206
+
+Ensure you have the correct `keystore.p12` file that comes with your branch (`stable` or `development`). Also ensure the password is set properly in Grasscutters `config.json` (blank for `stable`, "123456" for `development`).
+
 ## Infinite CMD Windows
 
 If you are getting infinite CMD windows for any of the scripts (such as the proxy installation, or private server start), ensure you have UAC (user access control) set to any option that requires asking. Ensure your user account can open things as Admin.