diff --git a/c0parser.cabal b/c0parser.cabal
--- a/c0parser.cabal
+++ b/c0parser.cabal
@@ -1,5 +1,5 @@
 Name:                c0parser
-Version:             0.1
+Version:             0.1.0.1
 Synopsis:            Simple C0 Parser
 Description:         The package contains a parser for C0 programs.
 	             The C0-language is introduced in the basic programming course \"Algorithmisches Denken und imperative Programmierung\" (WS 2011/12 and later) at the University of Bonn.
diff --git a/src/Language/C0/Parser/C0Parser.hs b/src/Language/C0/Parser/C0Parser.hs
--- a/src/Language/C0/Parser/C0Parser.hs
+++ b/src/Language/C0/Parser/C0Parser.hs
@@ -24,9 +24,9 @@
 yesNo input = 
   case runP pYesNo [] "While Parsing C0 Program ..." input of
     Right b -> b
-    Left  e -> error "The impossible happened! A never failing parser failed."
+    Left  e -> error ("The impossible happened! A never failing parser failed with: " ++ show e)
 
-pYesNo = (pProgram >> return True) <|> return False
+pYesNo = (try pProgram >> return True) <|> return False
 
 wsOrCmts :: CharParser [String] ()
 wsOrCmts = do