There has been an I/O error: error #2038

Question

hello guys how r u ..

i downloaded the project from codeproject, you can download from here -->" http://www.codeproject.com/KB/aspnet/FlashUpload.aspx "  and i simply deploy on iis in my win7 operating system but  when i upload files there is error occur 
" There has been an I/O error: error #2038 " 

what does that mean  and  how this error can be resolved ...

reply soon


Thanks.