diff --git a/src/util/pattern.rs b/src/util/pattern.rs
index a857bff..e8d37d0 100644
--- a/src/util/pattern.rs
+++ b/src/util/pattern.rs
@@ -6,16 +6,17 @@ use std::{
 
 type ParseError = Box<dyn std::error::Error>;
 
-trait Pattern<'a> {
-    pub fn execute(&self, values: &'a mut [RawColor]);
-    pub fn parse(args: Vec<String>) -> Result<Self, ParseError>;
+pub trait Pattern<'a> {
+    fn execute(&self, values: &'a mut [RawColor]);
+    fn parse(args: Vec<String>) -> Result<Self, ParseError> where Self: Sized;
 }
 
 impl<'a> TryFrom<Vec<String>> for Box<dyn Pattern<'a>> {
-    fn try_from(s: Vec<String>) -> Result<Self, ParseError> {
+    type Error = ParseError;
+    fn try_from(s: Vec<String>) -> Result<Self, Self::Error> {
         match s[0].as_str() {
-            "unit" => Unit::parse(s),
-            "val" => Value::parse(s),
+            "unit" => Ok(Box::new(Unit::parse(s).unwrap()) as Box<dyn Pattern>),
+            "val" => Ok(Box::new(Value::parse(s).unwrap()) as Box<dyn Pattern>),
             _ => Err("No Match".into())
         }
     }
@@ -87,7 +88,7 @@ impl<'a> Pattern<'a> for Value {
                         })
                     }
                 },
-                Err(e) => Err(e) 
+                Err(e) => Err(Box::new(e)) 
             }
         }
     }
@@ -96,4 +97,4 @@ impl<'a> Pattern<'a> for Value {
 pub fn parse_line(v: Vec<String>) -> Result<Box<dyn Pattern<'static>>, ParseError> {
     let res: Result<Box<dyn Pattern>, ParseError> = v.try_into();
     res
-}
\ No newline at end of file
+}