Include "error: " in parsing error messages

Oversight. Makes them easier to find in logs.

1 files changed, 1 insertions, 1 deletions

diff --git a/kconfiglib.py b/kconfiglib.py
index d152b76..f61d524 100644
--- a/kconfiglib.py
+++ b/kconfiglib.py
@@ -3863,7 +3863,7 @@ class Kconfig(object):
                                    .format(sym.name_and_loc))
 
     def _parse_error(self, msg):
-        raise KconfigError("{}couldn't parse '{}': {}".format(
+        raise KconfigError("{}error: couldn't parse '{}': {}".format(
             "" if self.filename is None else
                 "{}:{}: ".format(self.filename, self.linenr),
             self._line.strip(), msg))