Work on new tree system

src/error.rs

@@ -5,6 +5,11 @@ pub type Result<T> = std::result::Result<T, ModuleError>;
 ///Generic error type for module-related operations.
 #[derive(Clone, Debug, serde::Serialize, serde::Deserialize)]
 pub enum ModuleError {
+    NoError,
+
+    TreeNotExist,
+    TreeMessageError(String),
+
     LibLoadingError(String),
     // LogError(log::SetLoggerError),
     LinkError(String),
@@ -12,8 +17,6 @@ pub enum ModuleError {
     DatabaseError(String),
     SerdeJsonError(String),
 
-    TreeMessageError(String),
-
     Error(String),
 }