diff --git a/Cargo.toml b/Cargo.toml
index e7f0537..f2052db 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -8,6 +8,8 @@ exclude = [
     "projects/.DS_Store",
 ]
 
+[workspace.dependencies]
+
 [profile.release]
 lto = true
 panic = "abort"
diff --git a/projects/sub_projects/Cargo.toml b/projects/sub_projects/Cargo.toml
index 04f25bc..9cf797a 100644
--- a/projects/sub_projects/Cargo.toml
+++ b/projects/sub_projects/Cargo.toml
@@ -4,9 +4,11 @@ publish = false
 version = "0.0.0"
 authors = ["Aster <192607617@qq.com>"]
 description = "..."
-repository = "https://github.com/oovm/sub_projects"
+categories = ["rust-patterns"]
+homepage = "https://github.com/oovm/RustTemplate"
+repository = "https://github.com/oovm/RustTemplate"
 documentation = "https://docs.rs/sub_projects"
-readme = "Readme.md"
+readme = "readme.md"
 license = "MPL-2.0"
 edition = "2021"
 exclude = ["package.json", "tests/**"]
diff --git a/projects/sub_projects/src/errors.rs b/projects/sub_projects/src/errors.rs
deleted file mode 100644
index 982023b..0000000
--- a/projects/sub_projects/src/errors.rs
+++ /dev/null
@@ -1,6 +0,0 @@
-#[derive(Debug, Copy, Clone)]
-pub enum Error {
-    UnknownError
-}
-
-pub type Result<T> = std::result::Result<T, Error>;
diff --git a/projects/sub_projects/src/errors/convert.rs b/projects/sub_projects/src/errors/convert.rs
new file mode 100644
index 0000000..0042f45
--- /dev/null
+++ b/projects/sub_projects/src/errors/convert.rs
@@ -0,0 +1,9 @@
+use super::*;
+
+impl From<ExampleErrorKind> for ExampleError {
+    fn from(value: ExampleErrorKind) -> Self {
+        Self {
+            kind: Box::new(value),
+        }
+    }
+}
\ No newline at end of file
diff --git a/projects/sub_projects/src/errors/display.rs b/projects/sub_projects/src/errors/display.rs
new file mode 100644
index 0000000..9fe264c
--- /dev/null
+++ b/projects/sub_projects/src/errors/display.rs
@@ -0,0 +1,23 @@
+use super::*;
+
+impl Error for ExampleError {}
+
+
+impl Debug for ExampleError {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        Debug::fmt(&self.kind, f)
+    }
+}
+
+impl Display for ExampleError {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        Display::fmt(&self.kind, f)
+    }
+}
+
+
+impl Display for ExampleErrorKind {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        match self { ExampleErrorKind::UnknownError => { write!(f, "UnknownError") } }
+    }
+}
\ No newline at end of file
diff --git a/projects/sub_projects/src/errors/mod.rs b/projects/sub_projects/src/errors/mod.rs
new file mode 100644
index 0000000..3c864f9
--- /dev/null
+++ b/projects/sub_projects/src/errors/mod.rs
@@ -0,0 +1,24 @@
+use std::fmt::{Debug, Formatter};
+use std::error::Error;
+use std::fmt::Display;
+
+mod display;
+mod convert;
+
+/// The result type of this crate.
+pub type Result<T> = std::result::Result<T, ExampleError>;
+
+/// A boxed error kind, wrapping an [ExampleErrorKind].
+#[derive(Clone)]
+pub struct ExampleError {
+    kind: Box<ExampleErrorKind>,
+}
+
+/// The kind of [ExampleError].
+#[derive(Debug, Copy, Clone)]
+pub enum ExampleErrorKind {
+    /// An unknown error.
+    UnknownError
+}
+
+
diff --git a/projects/sub_projects/src/lib.rs b/projects/sub_projects/src/lib.rs
index 965d2c2..77909d1 100644
--- a/projects/sub_projects/src/lib.rs
+++ b/projects/sub_projects/src/lib.rs
@@ -6,4 +6,4 @@
 
 mod errors;
 
-pub use crate::errors::{Error, Result};
+pub use crate::errors::{ExampleErrorKind, Result, ExampleError};