DotNetZip Stopped Working

Mar 16, 2015 at 1:49 PM
Edited Mar 16, 2015 at 1:49 PM
I have a program written in VB.Net that has been running with no errors for several months. Suddenly, it no longer can successfully create a .zip file.

My code is:
        Dim zf As ZipFile = New ZipFile("C:\Test.zip")
        zf.AddFile("C:\SomeFile.txt")
        zf.Save("C:\Test.zip")
The file is created, but it fails when I try to un-zip it.
        Dim zip1 As New ZipFile("C:\Test.zip")
        zip1.ExtractAll("C:\NewPath\")
The "ExtractAll" statement returns the error:
      bad read of entry SomeFile.txt from compressed archive.
My system runs Windows 7 (64-bit) & the development environment is VisualStudio 2013 Express.

As I said, this program has been running for several months with no issues. There have been no changes other than the usual Windows updates.

Help!!!!