diff --git a/jubeatools/formats/jubeat_analyser/memo/load.py b/jubeatools/formats/jubeat_analyser/memo/load.py
index b49b6a8..46ac1bb 100644
--- a/jubeatools/formats/jubeat_analyser/memo/load.py
+++ b/jubeatools/formats/jubeat_analyser/memo/load.py
@@ -324,11 +324,11 @@ class MemoParser(JubeatAnalyserParser):
 
 def _load_memo_file(lines: List[str]) -> Song:
     parser = MemoParser()
-    for i, raw_line in enumerate(lines):
+    for i, raw_line in enumerate(lines, start=1):
         try:
             parser.load_line(raw_line)
         except Exception as e:
-            raise SyntaxError(f"On line {i+1}\n{e}")
+            raise SyntaxError(f"On line {i}\n{e}")
 
     parser.finish_last_few_notes()
     metadata = Metadata(
diff --git a/jubeatools/formats/jubeat_analyser/memo1/load.py b/jubeatools/formats/jubeat_analyser/memo1/load.py
index 9364523..4479d05 100644
--- a/jubeatools/formats/jubeat_analyser/memo1/load.py
+++ b/jubeatools/formats/jubeat_analyser/memo1/load.py
@@ -317,13 +317,11 @@ class Memo1Parser(JubeatAnalyserParser):
 
 def _load_memo1_file(lines: List[str]) -> Song:
     parser = Memo1Parser()
-    for i, raw_line in enumerate(lines):
+    for i, raw_line in enumerate(lines, start=1):
         try:
             parser.load_line(raw_line)
         except Exception as e:
-            raise SyntaxError(
-                f"Error while parsing memo line {i} :\n" f"{type(e).__name__}: {e}"
-            ) from None
+            raise SyntaxError(f"On line {i}\n{e}")
 
     parser.finish_last_few_notes()
     metadata = Metadata(
diff --git a/jubeatools/formats/jubeat_analyser/memo2/load.py b/jubeatools/formats/jubeat_analyser/memo2/load.py
index 96252b8..b6c6cc0 100644
--- a/jubeatools/formats/jubeat_analyser/memo2/load.py
+++ b/jubeatools/formats/jubeat_analyser/memo2/load.py
@@ -438,13 +438,11 @@ class Memo2Parser(JubeatAnalyserParser):
 
 def _load_memo2_file(lines: List[str]) -> Song:
     parser = Memo2Parser()
-    for i, raw_line in enumerate(lines):
+    for i, raw_line in enumerate(lines, start=1):
         try:
             parser.load_line(raw_line)
         except Exception as e:
-            raise SyntaxError(
-                f"Error while parsing memo line {i} :\n" f"{type(e).__name__}: {e}"
-            ) from None
+            raise SyntaxError(f"On line {i}\n{e}")
 
     parser.finish_last_few_notes()
     metadata = Metadata(
diff --git a/jubeatools/formats/jubeat_analyser/mono_column/load.py b/jubeatools/formats/jubeat_analyser/mono_column/load.py
index ae60f6f..6e45515 100644
--- a/jubeatools/formats/jubeat_analyser/mono_column/load.py
+++ b/jubeatools/formats/jubeat_analyser/mono_column/load.py
@@ -258,14 +258,11 @@ def load_mono_column(path: Path) -> Song:
 
 def _load_mono_column_file(lines: List[str]) -> Song:
     parser = MonoColumnParser()
-    for i, raw_line in enumerate(lines):
+    for i, raw_line in enumerate(lines, start=1):
         try:
             parser.load_line(raw_line)
         except Exception as e:
-            raise SyntaxError(
-                f"Error while parsing mono column line {i} :\n"
-                f"{type(e).__name__}: {e}"
-            ) from None
+            raise SyntaxError(f"On line {i}\n{e}")
 
     metadata = Metadata(
         title=parser.title,
diff --git a/jubeatools/utils.py b/jubeatools/utils.py
index 78232a4..7ed459d 100644
--- a/jubeatools/utils.py
+++ b/jubeatools/utils.py
@@ -2,7 +2,6 @@ import unicodedata
 from functools import reduce
 from math import gcd
 from typing import Callable, Iterable, Optional, TypeVar
-from numbers import Number
 
 
 def single_lcm(a: int, b: int) -> int: