diff --git a/nbs/__init__.py b/nbs/__init__.py
index ee79cc3..764a261 100644
--- a/nbs/__init__.py
+++ b/nbs/__init__.py
@@ -41,8 +41,9 @@ def sync_host(self, host):
         '''
         try:
             nbhost = self.netbox.ipam.ip_addresses.get(address=host[0])
-        except ValueError:
-            logging.error(f'duplicated: {host[0]}/32')
+        except ValueError as e:
+            logging.error(e)
+            logging.error(f'possibly duplicated: {host[0]}/32')
             self.stats['errors'] += 1
             return False
 
diff --git a/netbox-scanner.conf b/netbox-scanner.conf
index e36825f..3988316 100644
--- a/netbox-scanner.conf
+++ b/netbox-scanner.conf
@@ -1,4 +1,5 @@
 [NETBOX]
+# format => http(s)://IP:PORT
 address    = <server>
 token      = <token>
 logs       = logs/
diff --git a/requirements.txt b/requirements.txt
index 0bc0275..ed9fef9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -2,6 +2,7 @@ certifi==2020.4.5.1
 chardet==3.0.4
 idna==2.9
 pynetbox==4.3.1
-requests==2.23.0
-six==1.15.0
-urllib3==1.26.5
+requests
+six
+urllib3
+setuptools
\ No newline at end of file