diff --git a/src/command/config/migrate/v20240701.rs b/src/command/config/migrate/v20240701.rs
index cb1b2ae..e536051 100644
--- a/src/command/config/migrate/v20240701.rs
+++ b/src/command/config/migrate/v20240701.rs
@@ -446,7 +446,7 @@ pub(super) async fn run() -> Result<(), Error> {
                 .as_bytes(),
         )
         .map_err(WriteTomlConfigError::ServerWrite)?;
-    cprintln!("<g!><bold>config/server.toml</></> has been created!");
+    cprintln!("<bold>config/server.toml</> has been created!");
 
     let mut client_toml =
         fs::File::create("config/client.toml").map_err(WriteTomlConfigError::ClientWrite)?;
@@ -457,7 +457,7 @@ pub(super) async fn run() -> Result<(), Error> {
                 .as_bytes(),
         )
         .map_err(WriteTomlConfigError::ClientWrite)?;
-    cprintln!("<g><bold>config/client.toml</></> has been created!");
+    cprintln!("<bold>config/client.toml</> has been created!");
 
     Ok(())
 }
diff --git a/src/config/server.rs b/src/config/server.rs
index c0cc8f5..f6f1eca 100644
--- a/src/config/server.rs
+++ b/src/config/server.rs
@@ -6,7 +6,7 @@
 // does not take care of it.
 
 use serde::{Deserialize, Serialize};
-use validator::{Validate, ValidationErrors};
+use validator::Validate;
 
 #[derive(Deserialize, Serialize, Validate, Debug)]
 pub struct Config {
@@ -81,6 +81,7 @@ pub struct CacheServer {
     pub port: u16,
     pub user: Option<String>,
     pub password: Option<String>,
+    #[validate(range(min = 0, max = 15))]
     pub index: Option<u8>,
     pub prefix: Option<String>,
 }
diff --git a/src/main.rs b/src/main.rs
index 150a143..b7979ee 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -2,6 +2,7 @@ mod command;
 mod config;
 
 use clap::{Parser, Subcommand};
+use color_print::cprintln;
 
 /// latest Firefish version as of this fishctl release
 const FIREFISH_VERSION: &str = "20240613";
@@ -37,7 +38,7 @@ async fn main() {
     let res = run().await;
 
     if let Err(err) = res {
-        println!("An error occurred!");
+        cprintln!("<r!><bold>Error:</></>");
         println!("      raw: {:?}", err);
         println!("  message: {}", err);