utilise le mode sprintf pour error

@tsg_nc/tsg_nc.m

@@ -91,8 +91,9 @@ for i=1:ncv.size
   % check if line begin and end with '#' (we add the 5 header lines)
   % ----------------------------------------------------------------_
   if ~(strcmp(id, '#') & strcmp(endl, '#'))
-    error(['mismatch field number in ' file ', line: ' int2str(i+5) ...
-           ' ... Check your file']);
+    error('tsgqc_GUI:tsg_nc', ...
+          'mismatch field number in %s, line: %d\nCheck your file : %s ...', ...
+           file, i+5, file);
   end
   
   % get key