iTunes Error 3194 While Restoring or Updating iOS

Hello friends,
I get this error message when I try to restore the iPhone using iTunes. Last month I did this without any problem. But now this error message appeared in front of me. Is this a problem with the version? Do I need to update the version to latest one? Please help me correct the error. Thanks.

iTunes
The Phone iPhone could not be read. An unknown error occurred(3194).
OK
