diff --git a/module.lua b/module.lua
index d9237b2..430b8cf 100644
--- a/module.lua
+++ b/module.lua
@@ -2,11 +2,11 @@ function Aux_module(name)
     local data, is_public, is_declared, public_interface, private_interface, public, private = {}, {}, {}, {}, {}, {}, {}
     setmetatable(public_interface, {
         __newindex = function(_, key)
-            error('Illegal write of attribute "'..key..'" on public interface of "'..name..'"!')
+            error('Illegal write of attribute "'..key..'" on public interface of "'..name..'"!', 2)
         end,
         __index = function(_, key)
             if not is_public[key] then
-                error('Access of undeclared attribute "'..key..'" on public interface of "'..name..'"!')
+                error('Access of undeclared attribute "'..key..'" on public interface of "'..name..'"!', 2)
             end
             if is_public[key] then
                 return data[key]
@@ -19,13 +19,13 @@ function Aux_module(name)
     setmetatable(private_interface, {
         __newindex = function(_, key, value)
             if not is_declared[key] then
-                error('Assignment of undeclared attribute "'..key..'" on private interface of "'..name..'"!')
+                error('Assignment of undeclared attribute "'..key..'" on private interface of "'..name..'"!', 2)
             end
             data[key] = value
         end,
         __index = function(_, key)
             if not is_declared[key] then
-                error('Access of undeclared attribute "'..key..'" on private interface of "'..name..'"!')
+                error('Access of undeclared attribute "'..key..'" on private interface of "'..name..'"!', 2)
             end
             return data[key]
         end,
@@ -36,26 +36,26 @@ function Aux_module(name)
     setmetatable(public, {
         __newindex = function(_, key, value)
             if is_declared[key] then
-                error('Multiple declarations of "'..key..'" in "'..name..'"!')
+                error('Multiple declarations of "'..key..'" in "'..name..'"!', 2)
             end
             data[key] = value
             is_public[key] = true
             is_declared[key] = true
         end,
         __index = function(_, key)
-            error('Illegal read of attribute "'..key..'" on public keyword in "'..name..'"!')
+            error('Illegal read of attribute "'..key..'" on public keyword in "'..name..'"!', 2)
         end,
     })
     setmetatable(private, {
         __newindex = function(_, key, value)
             if is_declared[key] then
-                error('Multiple declarations of "'..key..'" in "'..name..'"!')
+                error('Multiple declarations of "'..key..'" in "'..name..'"!', 2)
             end
             data[key] = value
             is_declared[key] = true
         end,
         __index = function(_, key)
-            error('Illegal read of attribute "'..key..'" on private keyword in "'..name..'"!')
+            error('Illegal read of attribute "'..key..'" on private keyword in "'..name..'"!', 2)
         end,
     })
     return { public_interface, private_interface, public, private }