diff --git a/cps/server.py b/cps/server.py
index d27fe239..ed5b63c7 100644
--- a/cps/server.py
+++ b/cps/server.py
@@ -194,7 +194,7 @@ class WebServer(object):
         os.execv(sys.executable, arguments)
         return True
 
-    def _killServer(self, ignored_signum, ignored_frame):
+    def _killServer(self, __, ___):
         self.stop()
 
     def stop(self, restart=False):
diff --git a/cps/services/worker.py b/cps/services/worker.py
index 543d438f..b72c0636 100644
--- a/cps/services/worker.py
+++ b/cps/services/worker.py
@@ -8,7 +8,7 @@ try:
     import queue
 except ImportError:
     import Queue as queue
-from datetime import datetime, timedelta
+from datetime import datetime
 from collections import namedtuple
 
 from cps import logger
diff --git a/cps/tasks/convert.py b/cps/tasks/convert.py
index ba905047..a9cbfbd2 100644
--- a/cps/tasks/convert.py
+++ b/cps/tasks/convert.py
@@ -193,7 +193,7 @@ class TaskConvert(CalibreTask):
                 ele = ele.decode('utf-8')
             log.debug(ele.strip('\n'))
             if not ele.startswith('Traceback') and not ele.startswith('  File'):
-                error_message = _("Calibre failed with error: %(error)s", ele.strip('\n'))
+                error_message = _("Calibre failed with error: %(error)s", error=ele.strip('\n'))
         return check, error_message
 
     @property
diff --git a/cps/tasks/mail.py b/cps/tasks/mail.py
index 3b2db6eb..f83cc4fa 100644
--- a/cps/tasks/mail.py
+++ b/cps/tasks/mail.py
@@ -175,6 +175,8 @@ class TaskEmail(CalibreTask):
                 text = e.smtp_error.decode('utf-8').replace("\n", '. ')
             elif hasattr(e, "message"):
                 text = e.message
+            elif hasattr(e, "args"):
+                text = '\n'.join(e.args)
             else:
                 log.exception(e)
                 text = ''
diff --git a/test/Calibre-Web TestSummary.html b/test/Calibre-Web TestSummary.html
index 98894833..10e2e0ee 100755
--- a/test/Calibre-Web TestSummary.html	
+++ b/test/Calibre-Web TestSummary.html	
@@ -36,12 +36,16 @@
       <div class="col-xs-12 col-sm-6">
       <div class="row">
         <div class="col-xs-6 col-md-6 col-sm-offset-3" style="margin-top:50px;">
-            <p class='text-justify attribute'><strong>Start Time: </strong>2020-08-29 11:15:36</p>
+            
+            <p class='text-justify attribute'><strong>Start Time: </strong>2020-08-30 15:47:09</p>
+            
         </div>
       </div>
       <div class="row">
         <div class="col-xs-6 col-md-6 col-sm-offset-3">
-            <p class='text-justify attribute'><strong>Stop Time: </strong>2020-08-29 12:34:46</p>
+            
+            <p class='text-justify attribute'><strong>Stop Time: </strong>2020-08-30 17:06:27</p>
+            
         </div>
       </div>
       <div class="row">
@@ -356,7 +360,7 @@
                     </div>
                     <div class="text-left pull-left">
                         <pre class="text-left">Traceback (most recent call last):
-  File "/home/matthias/Entwicklung/calibre-web-test/test/test_cover_edit_books.py", line 89, in test_upload_jpg
+  File "/home/matthias/Entwicklung/calibre-web-test/test/test_cover_edit_books.py", line 91, in test_upload_jpg
     self.assertTrue(self.check_element_on_page((By.ID, 'flash_alert')))
 AssertionError: False is not true</pre>
                     </div>
@@ -920,7 +924,7 @@ AssertionError: False is not true</pre>
                     </div>
                     <div class="text-left pull-left">
                         <pre class="text-left">Traceback (most recent call last):
-  File "/home/matthias/Entwicklung/calibre-web-test/test/test_edit_books.py", line 734, in test_upload_cover_hdd
+  File "/home/matthias/Entwicklung/calibre-web-test/test/test_edit_books.py", line 735, in test_upload_cover_hdd
     self.assertTrue(False, "Browser-Cache Problem: Old Cover is displayed instead of New Cover")
 AssertionError: False is not true : Browser-Cache Problem: Old Cover is displayed instead of New Cover</pre>
                     </div>