Index: src/Common/NetTopologySuite/Utilities/RToolsUtil/Opts.cs
===================================================================
diff -u -r5fc71a385897af92ccb092f2f969b5709afab85a -r4c09f28891546d714fa6a15d36b70d8a6b9a4aa7
--- src/Common/NetTopologySuite/Utilities/RToolsUtil/Opts.cs	(.../Opts.cs)	(revision 5fc71a385897af92ccb092f2f969b5709afab85a)
+++ src/Common/NetTopologySuite/Utilities/RToolsUtil/Opts.cs	(.../Opts.cs)	(revision 4c09f28891546d714fa6a15d36b70d8a6b9a4aa7)
@@ -112,7 +112,7 @@
                 "-number",
                 "-3.2"
             };
-            string errorMessage = null;
+            string errorMessage;
 
             Opts opts = new Opts();
             opts.ParseSpec = parseSpec;