I’m getting error extracting file in Winrar

Can anyone help me? I am having a hard time here trying to unzipped a *.rar file that contains a folder with several files, using WinRAR 3.30. I right click on the file and click, "extract here".
The procedure starts, but there is an error message saying: “Invalid or Corrupt authenticity Information”. The file gets extracted though, regardless of the error message. I remember, when there's an error message occurred, the extraction would stop. Is the extracted file corrupt?
The folder with the files seems to be ok for me. But should I worry about the thighs?
