diff --git a/src/ONCOCNV_getCounts.pl b/src/ONCOCNV_getCounts.pl
index 212567c..af85b7d 100644
--- a/src/ONCOCNV_getCounts.pl
+++ b/src/ONCOCNV_getCounts.pl
@@ -50,7 +50,7 @@ =head1 AUTHORS
 use strict;
 use warnings;
 use diagnostics;
-
+open ERR, "> error.txt " || die "cannot open error.txt : $!\n";
 
 my $usage = qq{