-fix error message

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@508866 13f79535-47bb-0310-9956-ffa450edef68

src/main/org/apache/tools/ant/taskdefs/optional/ssh/SSHExec.java

@@ -145,7 +145,7 @@ public class SSHExec extends SSHBase {
             throw new BuildException("Password or Keyfile is required.");
         }
         if (command == null && commandResource == null) {
-            throw new BuildException("Command or commandFile is required.");
+            throw new BuildException("Command or commandResource is required.");
         }
 
         /* called once */