typo in tutorial/rb/RubyServer.rb

Reviewed By: mcslee

Test Plan:

Revert Plan:


git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@665145 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/tutorial/rb/RubyServer.rb b/tutorial/rb/RubyServer.rb
index ea39e15..60d019f 100755
--- a/tutorial/rb/RubyServer.rb
+++ b/tutorial/rb/RubyServer.rb
@@ -42,7 +42,7 @@
       end
       val = work.num1 / work.num2
     else
-      x = InvalidOperation()
+      x = InvalidOperation.new()
       x.what = work.op
       x.why = "Invalid operation"
       raise x