diff --git a/src/cli.py b/src/cli.py
--- a/src/cli.py
+++ b/src/cli.py
@@ -2,7 +2,7 @@
 
 from argparse import ArgumentParser
 
-from shamira import generate, reconstruct
+from shamira import generate, reconstruct, SException
 
 
 def run():
@@ -49,16 +49,16 @@ def _generate(args):
 		shares=generate(args.secret,args.k,args.n,encoding)
 		for s in shares:
 			print(s)
-	except ValueError as e:
-		print("operation failed: ",e)
+	except SException as e:
+		print(e)
 
 
 def _reconstruct(args):
 	encoding=getEncoding(args)
 	try:
 		print(reconstruct(*args.share,encoding=encoding,raw=args.raw))
-	except ValueError as e:
-		print("operation failed: ",e)
+	except SException as e:
+		print(e)
 
 
 def getEncoding(args):