how to use NPOI on Unity3D?

Hi, When i use dll of NPOI [NPOI][1] to write Excel fill using unity3d.it's work with android platform but when i switch to ios it got this error "Cross compilation job Mono.WebBrowser.dll failed" ... Failed AOT cross compiler . hmmm how to fix it.you can testing it and detail to me,if it work or not.thanks [1]: http://npoi.codeplex.com/