diff --git a/addons/mod_loader/internal/mod_hook_preprocessor.gd b/addons/mod_loader/internal/mod_hook_preprocessor.gd
index 6d0ad328..c55fef0c 100644
--- a/addons/mod_loader/internal/mod_hook_preprocessor.gd
+++ b/addons/mod_loader/internal/mod_hook_preprocessor.gd
@@ -442,7 +442,7 @@ static func get_return_type_string(return_data: Dictionary) -> String:
 	if return_data.has("class_name") and not str(return_data.class_name).is_empty():
 		type_base = str(return_data.class_name)
 	else:
-		type_base = type_string(return_data.type)
+		type_base = get_type_name(return_data.type)
 
 	var type_hint: String = "" if return_data.hint_string.is_empty() else ("[%s]" % return_data.hint_string)
 
@@ -482,3 +482,90 @@ static func get_hook_check_else_string(
 				"METHOD_ARGS": method_arg_string_names_only
 			}
 		)
+
+
+# This function was taken from 
+# https://github.com/godotengine/godot/blob/7e67b496ff7e35f66b88adcbdd5b252d01739cbb/modules/gdscript/tests/scripts/utils.notest.gd#L69
+# It is used instead of type_string because type_string does not exist in Godot 4.1
+static func get_type_name(type: Variant.Type) -> String:
+	match type:
+		TYPE_NIL:
+			return "Nil" # `Nil` in core, `null` in GDScript.
+		TYPE_BOOL:
+			return "bool"
+		TYPE_INT:
+			return "int"
+		TYPE_FLOAT:
+			return "float"
+		TYPE_STRING:
+			return "String"
+		TYPE_VECTOR2:
+			return "Vector2"
+		TYPE_VECTOR2I:
+			return "Vector2i"
+		TYPE_RECT2:
+			return "Rect2"
+		TYPE_RECT2I:
+			return "Rect2i"
+		TYPE_VECTOR3:
+			return "Vector3"
+		TYPE_VECTOR3I:
+			return "Vector3i"
+		TYPE_TRANSFORM2D:
+			return "Transform2D"
+		TYPE_VECTOR4:
+			return "Vector4"
+		TYPE_VECTOR4I:
+			return "Vector4i"
+		TYPE_PLANE:
+			return "Plane"
+		TYPE_QUATERNION:
+			return "Quaternion"
+		TYPE_AABB:
+			return "AABB"
+		TYPE_BASIS:
+			return "Basis"
+		TYPE_TRANSFORM3D:
+			return "Transform3D"
+		TYPE_PROJECTION:
+			return "Projection"
+		TYPE_COLOR:
+			return "Color"
+		TYPE_STRING_NAME:
+			return "StringName"
+		TYPE_NODE_PATH:
+			return "NodePath"
+		TYPE_RID:
+			return "RID"
+		TYPE_OBJECT:
+			return "Object"
+		TYPE_CALLABLE:
+			return "Callable"
+		TYPE_SIGNAL:
+			return "Signal"
+		TYPE_DICTIONARY:
+			return "Dictionary"
+		TYPE_ARRAY:
+			return "Array"
+		TYPE_PACKED_BYTE_ARRAY:
+			return "PackedByteArray"
+		TYPE_PACKED_INT32_ARRAY:
+			return "PackedInt32Array"
+		TYPE_PACKED_INT64_ARRAY:
+			return "PackedInt64Array"
+		TYPE_PACKED_FLOAT32_ARRAY:
+			return "PackedFloat32Array"
+		TYPE_PACKED_FLOAT64_ARRAY:
+			return "PackedFloat64Array"
+		TYPE_PACKED_STRING_ARRAY:
+			return "PackedStringArray"
+		TYPE_PACKED_VECTOR2_ARRAY:
+			return "PackedVector2Array"
+		TYPE_PACKED_VECTOR3_ARRAY:
+			return "PackedVector3Array"
+		TYPE_PACKED_COLOR_ARRAY:
+			return "PackedColorArray"
+		38: # TYPE_PACKED_VECTOR4_ARRAY
+			return "PackedVector4Array"
+	push_error("Argument `type` is invalid. Use `TYPE_*` constants.")
+	return "<invalid type>"
diff --git a/addons/mod_loader/mod_loader.gd b/addons/mod_loader/mod_loader.gd
index 73946ab9..e1176ebb 100644
--- a/addons/mod_loader/mod_loader.gd
+++ b/addons/mod_loader/mod_loader.gd
@@ -127,7 +127,8 @@ func _load_metadata(manifest_dict: Dictionary, zip_path := ""):
 
 func _load_mods(mod_data: Dictionary) -> void:
 	var mod_zip_paths: Array[String] = []
-	for mod: ModData in mod_data.values():
+	for _mod in mod_data.values():
+		var mod: ModData = _mod
 		if not mod.is_loadable:
 			continue
 		if not mod.zip_path:
diff --git a/addons/mod_loader/options/profiles/production_no_workshop.tres b/addons/mod_loader/options/profiles/production_no_workshop.tres
index 12c283de..7b5856c0 100644
--- a/addons/mod_loader/options/profiles/production_no_workshop.tres
+++ b/addons/mod_loader/options/profiles/production_no_workshop.tres
@@ -1,19 +1,19 @@
-[gd_resource type="Resource" script_class="ModLoaderOptionsProfile" load_steps=2 format=4 uid="uid://bodsw0jyh6rn5"]
+[gd_resource type="Resource" script_class="ModLoaderOptionsProfile" load_steps=2 format=3 uid="uid://bodsw0jyh6rn5"]
 
 [ext_resource type="Script" path="res://addons/mod_loader/resources/options_profile.gd" id="1"]
 
 [resource]
 script = ExtResource("1")
 enable_mods = true
-locked_mods = Array[String]([])
+locked_mods = []
 log_level = 2
-disabled_mods = Array[String]([])
+disabled_mods = []
 allow_modloader_autoloads_anywhere = false
 steam_id = 0
 override_path_to_mods = ""
 override_path_to_configs = ""
 override_path_to_workshop = ""
 ignore_deprecated_errors = false
-ignored_mod_names_in_log = Array[String]([])
+ignored_mod_names_in_log = []
 load_from_steam_workshop = false
 load_from_local = true
diff --git a/addons/mod_loader/options/profiles/production_workshop.tres b/addons/mod_loader/options/profiles/production_workshop.tres
index 9c2885f9..0b610bcb 100644
--- a/addons/mod_loader/options/profiles/production_workshop.tres
+++ b/addons/mod_loader/options/profiles/production_workshop.tres
@@ -1,19 +1,19 @@
-[gd_resource type="Resource" script_class="ModLoaderOptionsProfile" load_steps=2 format=4 uid="uid://cg0vv5k4o71rv"]
+[gd_resource type="Resource" script_class="ModLoaderOptionsProfile" load_steps=2 format=3 uid="uid://cg0vv5k4o71rv"]
 
 [ext_resource type="Script" path="res://addons/mod_loader/resources/options_profile.gd" id="1"]
 
 [resource]
 script = ExtResource("1")
 enable_mods = true
-locked_mods = Array[String]([])
+locked_mods = []
 log_level = 2
-disabled_mods = Array[String]([])
+disabled_mods = []
 allow_modloader_autoloads_anywhere = false
 steam_id = 0
 override_path_to_mods = ""
 override_path_to_configs = ""
 override_path_to_workshop = ""
 ignore_deprecated_errors = false
-ignored_mod_names_in_log = Array[String]([])
+ignored_mod_names_in_log = []
 load_from_steam_workshop = true
 load_from_local = true