Can not open the file as [zip] archive on nupkg when generating delta

Hey guys, little problem I have here. For first build of my app everything works smoothly, it generates .exe and -full.nupkg files as well as RELEASES file. But when I try to create new version of my app all I get is this error:
```Failed with exit code: 4294967295
Output:
System.AggregateException: One or more error occured ---> System.Exception: 7-Zip [64] 16.04 : Copyright (c) 1999-2016
Igor Pavlov : 2016-10-04

Scanning the drive for archives:
1 file, 0 bytes

Extracting archive: C:\project\dist\installers\app-2.0.0-full.nupkg

Can't open as archive: 1
Files: 0
Size: 0
Compressed: 0

ERROR: C:\project\dist\installers\app-2.0.0-full.nupkg
C:\project\dist\installers\app-2.0.0-full.nupkg
Open ERROR: Can not open the file as [zip] archive

ERRORS:
Is not archive
v Squirrel.Utility.d__22.MoveNext()
v System.Threading.Tasks.Task.ThrowIfExceptional(Boolean includeTaskCanceledExceptions)
v System.Threading.Tasks.Task.Wait(Int32 millisecondsTimeout, CancellationToken cancellationToken)
v Squirrel.DeltaPackageBuilder.CreateDeltaPackage(ReleasePackage basePackage, ReleasePackage newPackage, String outputFil
e)
v Squirrel.Update.Program.Releasify(String package, String targetDir, String packagesDir, String bootstrapperExe, String
backgroundGif, String signingOpts, String baseUrl, String setupIcon, Boolean generateMsi, String frameworkVersion, Boolean g
enerateDeltas)
v Squirrel.Update.Program.executeCommandLine(String[] args)
v Squirrel.Update.Program.main(String[] args)
v Squirrel.Update.Program.Main(String[] args)
---> (Inner Exception #0) System.Exception: 7-Zip [64] 16.04 : Copyright (c) 1999-2016 Igor Pavlov : 2016-10-04
```

Any idea what to do with this? My .nupkg file is about the same size as .exe file, build script can reach it but for some reason it doesn't work. Oh and one more thing, after this error, my -full.nupkg file is 0 bytes size, but new 2.0.1-full.nupkg file is generated (only .exe is missing) and it is bigger then previously-existing 2.0.0-full.nupkg file.

Here is screenshot of files after second build with error - http://prntscr.com/gw0vpq

Thanks for any help, because I don't really know how to solve this problem and I've been bashing my head against it for a few days :)