该文件不是有效的VSIX包

Question

After installing Visual Studio 2017, I was able to work on this Vs package for a month or so until the first update. Now after I rebuild this Visual Studio package, and then try to install the VSIX, I get a message saying that it is an "invalid VSIX package".

Any help or pointers would be appreciated...

EDIT:

The log shows this:

Unable to find an entry point named '?' in DLL 'PkgdefMgmt.dll'

19/03/2017 10:16:02 PM - Microsoft VSIX Installer 19/03/2017 10:16:02 PM - ------------------------------------------- 19/03/2017 10:16:02 PM - vsixinstaller.exe version: 19/03/2017 10:16:02 PM - 15.0.26228.9 built by: D15RTWSVC 19/03/2017 10:16:02 PM - ------------------------------------------- 19/03/2017 10:16:02 PM - Command line parameters: 19/03/2017 10:16:02 PM - C:\\Program Files (x86)\\Microsoft Visual Studio\\2017\\Enterprise\\Common7\\IDE\\VSIXInstaller.exe,C:\\Service\\BSToolsProject_3\\Tools\\ProductivityTools\\Bin (Scenario Engine)\\Capitec.ScenarioEngineExtension.vsix 19/03/2017 10:16:02 PM - ------------------------------------------- 19/03/2017 10:16:02 PM - Microsoft VSIX Installer 19/03/2017 10:16:02 PM - ------------------------------------------- 19/03/2017 10:16:02 PM - Failed to initialize settings for Isolated Shell C:\\Program Files (x86)\\Microsoft SQL Server\\110\\Tools\\Binn\\ManagementStudio\\ssms.exe: Unable to find an entry point named '?' in DLL 'PkgdefMgmt.dll'. 19/03/2017 10:16:02 PM - Failed to initialize settings for Isolated Shell C:\\Program Files (x86)\\Microsoft SQL Server\\120\\Tools\\Binn\\ManagementStudio\\ssms.exe: Unable to find an entry point named '?' in DLL 'PkgdefMgmt.dll'. 19/03/2017 10:16:02 PM - Initializing Install... 19/03/2017 10:16:02 PM - Microsoft.VisualStudio.ExtensionManager.InvalidExtensionPackageException: The file is not a valid VSIX package. at Microsoft.VisualStudio.ExtensionManager.InstallableExtensionImpl.ReadVSIXManifestFromPackage(Stream stream, CultureInfo preferredCulture) at Microsoft.VisualStudio.ExtensionManager.InstallableExtensionImpl..ctor(String path, CultureInfo preferredCulture) at Microsoft.VisualStudio.ExtensionManager.ExtensionEngineImpl.CreateInstallableExtension(String extensionPath, CultureInfo preferredCulture) at Microsoft.VisualStudio.ExtensionManager.ExtensionEngineImpl.CreateInstallableExtension(String extensionPath) at VSIXInstaller.App.GetInstallableData(String vsixPath, Boolean isRepairSupported, IEnumerable 1& skuData) at VSIXInstaller.App.Initialize(Boolean isRepairSupported) at VSIXInstaller.App.Initialize() at System.Threading.Tasks.Task 1.InnerInvoke() at System.Threading.Tasks.Task.Execute()

Answer 1

Check that the VSIX file contains the required files that make it VSIX v3 file:

extension.vsixmanifest manifest.json catalog.json

And that the extension.vsixmanifest file contains a prerequisites section

https://docs.microsoft.com/en-us/visualstudio/extensibility/how-to-migrate-extensibility-projects-to-visual-studio-2017

Answer 2

(Applies to VS 2015)

The problem for me was the section

<Prerequisites>
    <Prerequisite Id="Microsoft.VisualStudio.Shell.12.0" Version="[12.0]" />
</Prerequisites>

in "source.extension.vsixmanifest" file.

After removing these lines, VSIX file started working.