diff --git a/VERSION b/VERSION
index e6adf3f..ea2303b 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-0.4
\ No newline at end of file
+0.5
\ No newline at end of file
diff --git a/pyproject.toml b/pyproject.toml
index 2b1adc6..c70d0c7 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -15,9 +15,7 @@ classifiers = [
     "License :: OSI Approved :: CeCILL-C",
     "Operating System :: OS Independent",
 ]
-dependencies = [
-    "systemd-python",
-]
+dependencies = [ ]
 dynamic = ["version"]
 
 [project.urls]
diff --git a/src/appengine/__init__.py b/src/appengine/__init__.py
index f4e2bd7..ca9ae07 100644
--- a/src/appengine/__init__.py
+++ b/src/appengine/__init__.py
@@ -5,7 +5,6 @@ import sys
 import traceback
 from configparser import ConfigParser
 import logging
-from systemd import journal
 import inspect
 from enum import Enum, auto
 import signal
@@ -49,6 +48,8 @@ class AppEngineException(Exception):
     def __init__(self, error: AEErrs, mesg=None) -> None:
         if mesg is None:
             self.mesg = str(error)
+        else:
+            self.mesg = mesg
         super().__init__(self.mesg)
         self.value = error.value
 
@@ -106,8 +107,8 @@ class Commands(Thread):
         self.stopped = True
 
     def free(self):
-        """ Virtual method used to clean resources for threaded Commands
-        when they are stopped.
+        """ Virtual method used to clean resources for all Commands
+        when the application is exited.
         """
         pass
 
@@ -300,7 +301,11 @@ class CommandsLoader:
         obj = None
         for n, c in members:
             if issubclass(c, Commands) and (n != "Commands"):
-                obj = c(conf, self.log)
+                try:
+                    obj = c(conf, self.log)
+                except:
+                    self.log.error(f"The object '{c.__name__}' could not be instantiated.")
+                    continue
                 obj.log = self.log
                 obj.lock = self.lock
                 obj.stop_all_event = self.stop_event
@@ -315,9 +320,15 @@ class CommandsLoader:
     def _load_dependencies(self):
         for k, v in self.cmods.items():
             if hasattr(v, "dependencies"):
-                for p in v.dependencies:
-                    if p in self.cmods.keys():
-                        setattr(v, p, self.cmods[p])
+                deps = v.dependencies
+                # dependencies can be a list or dictionary
+                if isinstance(v.dependencies, list):
+                    deps = {}
+                    for d in v.dependencies:
+                        deps[d] = d
+                for p, pv in deps.items():
+                    if pv in self.cmods.keys():
+                        setattr(v, p, self.cmods[pv])
                     else:
                         self.log.error(
                             'Dependency "{}" of module "{}" could not be satisfied'.format(
@@ -343,8 +354,7 @@ class CommandsLoader:
 
     def free(self):
         for k, v in self.cmods.items():
-            if v.threaded:
-                v.free()
+            v.free()
 
 
 class AppEngine:
@@ -396,12 +406,8 @@ class AppEngine:
             if is_writeable:
                 self.log.addHandler(logging.FileHandler(fname))
             else:
-                self.log.addHandler(journal.JournalHandler())
                 self.log.error('No write permissions: "{}"'.format(fname))
 
-        else:
-            self.log.addHandler(journal.JournalHandler())
-
     def exec(self, modpath: str = ""):
         self.cl = CommandsLoader(self.stop_event, self.conf, self.log, modpath)
         self.cl.start()