diff --git a/schainpy/__init__.py b/schainpy/__init__.py
index 55cce8f..ce6e1df 100644
--- a/schainpy/__init__.py
+++ b/schainpy/__init__.py
@@ -1,8 +1,8 @@
 """Signal chain python package"""
 
 try:
-    from .controller import Project
+    from schainpy.controller import Project
 except:
     pass
 
-__version__ = '3.0.0b4'
+__version__ = '3.0.0b5'
diff --git a/schainpy/controller.py b/schainpy/controller.py
index a020768..dc9c5d8 100644
--- a/schainpy/controller.py
+++ b/schainpy/controller.py
@@ -13,6 +13,7 @@ import ast
 import datetime
 import traceback
 import time
+import multiprocessing
 from multiprocessing import Process, Queue
 from threading import Thread
 from xml.etree.ElementTree import ElementTree, Element, SubElement
@@ -21,6 +22,8 @@ from schainpy.admin import Alarm, SchainWarning
 from schainpy.model import *
 from schainpy.utils import log
 
+if 'darwin' in sys.platform and sys.version_info[0] == 3 and sys.version_info[1] > 7:
+    multiprocessing.set_start_method('fork')
 
 class ConfBase():
 
@@ -636,7 +639,7 @@ class Project(Process):
         while not err:
             for conf in self.getUnits():
                 ok = conf.run()                
-                if ok is 'Error':
+                if ok == 'Error':
                     n -= 1
                     continue
                 elif not ok:
diff --git a/setup.py b/setup.py
index 64f96f3..5fa2a77 100644
--- a/setup.py
+++ b/setup.py
@@ -46,6 +46,7 @@ setup(
         "Programming Language :: Python :: 3.5",
         "Programming Language :: Python :: 3.6",
         "Programming Language :: Python :: 3.7",
+        "Programming Language :: Python :: 3.8",
         "Topic :: Scientific/Engineering",
     ],
     packages = {