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DotNetZip Stopped Working

Mar 16, 2015 at 2:49 PM
Edited Mar 16, 2015 at 2:49 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:\")
The file is created, but it fails when I try to un-zip it.
        Dim zip1 As New ZipFile("C:\")
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.