diff --git a/bin/is b/bin/is
index 0fd78b031e76cfdd3f5fa0e3c5ece2f13e1cac08..0268b9687fbeac41042785d430ccf46ca00b7e08 100755
--- a/bin/is
+++ b/bin/is
@@ -748,10 +748,10 @@ def main():
     except KeyboardInterrupt:
         warn("Keyboard Interrupted")
         exit(1)
-    except ISException as e:
-        error(u"%s.%s" % (e, e.get_tb()))
+    except ISError as e:
+        error(exception=e)
     except Exception as e:
-        error(u"Unknown error, please report it: %s." % e)
+        error(u"Unexpected error, please report it with debug enabled", exception=e)
 
 # Entry point
 if __name__ == '__main__':
diff --git a/installsystems/exception.py b/installsystems/exception.py
index 4887b2652395ee56354a99e348150649115de5af..fd7a959e9db387fd48195f7ed89fc678a01092e8 100644
--- a/installsystems/exception.py
+++ b/installsystems/exception.py
@@ -32,34 +32,46 @@ class ISException(Exception):
     '''
     Base exception class
     '''
-    def __init__(self, message='', exception=None):
-        self.message = message
+    def __init__(self, message="", exception=None):
+        self.message = unicode(message)
         self.exception = exception
         if exception:
             self.exc_info = sys.exc_info()
 
     def __str__(self):
         if self.exception:
-            return "%s: %s" % (self.message, self.exception)
+            return u"%s: %s" % (self.message, self.exception)
         else:
             return self.message
 
-    def get_tb(self):
-        if self.exception and installsystems.verbosity > 1:
-            sio = StringIO.StringIO()
+    def print_tb(self, fd=sys.stderr):
+        '''
+        Print traceback from embeded exception or current one
+        '''
+        from installsystems.printer import out
+        # coloring
+        out("#l##B#", fd=fd, endl="")
+        # print original exception traceback
+        if self.exception is not None:
             traceback.print_exception(self.exc_info[0], self.exc_info[1],
-                                      self.exc_info[2], file=sio)
-            str = "\n#R#%s" % sio.getvalue()
-            sio.close()
-            return str
-        return ""
+                                      self.exc_info[2], file=fd)
+        # print current exception traceback
+        else:
+            exc_info = sys.exc_info()
+            traceback.print_exception(exc_info[0], exc_info[1], exc_info[2],
+                                      file=fd)
+        # reset color
+        out("#R#", fd=fd, endl="")
+
 
 class ISError(ISException):
     '''
     Installsystems error; this exception will stop execution
     '''
 
+
 class ISWarning(ISException):
     '''
     Installsystems warning; this exception do not stop execution
     '''
+
diff --git a/installsystems/printer.py b/installsystems/printer.py
index fc8a48705fc56f64cf7c93d8e1386c108b667388..0ea6b5b6284d21963a6c06d21c7aaa1266dff09d 100644
--- a/installsystems/printer.py
+++ b/installsystems/printer.py
@@ -25,6 +25,7 @@ import sys
 import os
 import re
 import installsystems
+from installsystems.exception import *
 
 NOCOLOR = False
 
@@ -92,10 +93,22 @@ def fatal(message, quit=True, fd=sys.stderr, endl=os.linesep):
     if quit:
         os._exit(21)
 
-def error(message, quit=True, fd=sys.stderr, endl=os.linesep):
-    out(u"#light##red#Error:#reset# #red#%s#reset#" % message, fd, endl)
-    if sys.exc_info()[0] is not None and installsystems.verbosity > 1:
-        raise
+def error(message=None, exception=None, quit=True, fd=sys.stderr, endl=os.linesep):
+    # create error message
+    pmesg = u""
+    if message is not None:
+        pmesg += unicode(message)
+    if exception is not None:
+        if pmesg == "":
+            pmesg += unicode(exception)
+        else:
+            pmesg += u": %s" % unicode(exception)
+    # print error message
+    if pmesg != "":
+        out(u"#light##red#Error:#reset# #red#%s#reset#" % pmesg, fd, endl)
+    # print traceback in debug mode
+    if installsystems.verbosity > 1 and isinstance(exception, ISException):
+        exception.print_tb(fd)
     if quit:
         exit(42)