diff --git a/slpkg/blacklist.py b/slpkg/blacklist.py
index c49a2942..b870f20b 100644
--- a/slpkg/blacklist.py
+++ b/slpkg/blacklist.py
@@ -22,7 +22,8 @@ class Blacklist(Configs):
         if file_toml.is_file():
             try:
                 with open(file_toml, 'rb') as black:
-                    return tomli.load(black)['blacklist']['packages']
-            except tomli.TOMLDecodeError as error:
-                raise SystemExit(f"\nValueError: {error}: in the configuration file "
-                                 "'/etc/slpkg/blacklist.toml'\n")
+                    return tomli.load(black)['BLACKLIST']['PACKAGES']
+            except (tomli.TOMLDecodeError, KeyError) as error:
+                raise SystemExit(f"\nError: {error}: in the configuration file '/etc/slpkg/blacklist.toml'.\n"
+                                 f"\nIf you have upgraded the '{self.prog_name}' probably you need to run:\n"
+                                 f"mv {self.etc_path}/{self.prog_name}.toml.new {self.etc_path}/{self.prog_name}.toml\n")
diff --git a/slpkg/configs.py b/slpkg/configs.py
index 3839f5b6..5247841e 100644
--- a/slpkg/configs.py
+++ b/slpkg/configs.py
@@ -18,7 +18,7 @@ class LoadConfigs:
                 with open(config_path_file, 'rb') as conf:
                     return tomli.load(conf)
         except tomli.TOMLDecodeError as error:
-            raise SystemExit(f"\nValueError: {error}: in the configuration file "
+            raise SystemExit(f"\nError: {error}: in the configuration file "
                   "'/etc/slpkg/slpkg.toml'\n")
 
 
@@ -174,7 +174,7 @@ class Configs:
             file_pattern_conf: str = config['FILE_PATTERN']
 
         except KeyError as error:
-            raise SystemExit(f"\nKeyError: {error}: in the configuration file '/etc/slpkg/slpkg.toml'.\n"
+            raise SystemExit(f"\nError: {error}: in the configuration file '/etc/slpkg/slpkg.toml'.\n"
                              f"\nIf you have upgraded the '{prog_name}' probably you need to run:\n"
                              f"mv {etc_path}/{prog_name}.toml.new {etc_path}/{prog_name}.toml\n")