Hi I have build and deploy Labview VI's as Web Serice When my Input Control is a "String" the applications do not work(It works when the input control is a number) The message I get is :"This XML file does not appear to have any style information associated with it. The document tree is shown below." Does any one familiar with the issue? Thanks....Eran

So I'm still not convinced that your code is returning a string since it sounds like the only way you've tested it is with numeric inputs (which require different logic to return a string). Here's a quick web method that I threw together to prove that input and output of strings works in terminal mode. Works just fine for me. I am in LV 2011 SP1, but I would be very surprised if this is a bug with LV 2012.