Itextsharp API test failed when trying to submit to store

Question

Hi all,

In my metro application i have used itextshrp(added from nuget) to write data into the nitro pdfs,it was working fine in the application as well as in windows surface device. while i am trying to submit the app to store all the tests by windows app certification kit are successful except API test.I am getting error like API uses by itextsharp is unsupported in this type of app.

whats wrong in my app.if you know any body please give me solution as soon as possible.

Thanks in advance,