The language service could not be started: Exception encountered starting EditorServices

[H1-N1]

System Details
Operating system name and version: Windows 7 (x32)
VS Code version: 1.49.1
PowerShell extension version: 2020.6.0
Output from $PSVersionTable:

PS C:\Users\W> $PSVersionTable

Name Value

---

PSVersion 5.1.14409.1005
PSEdition Desktop
PSCompatibleVersions {1.0, 2.0, 3.0, 4.0...}
BuildVersion 10.0.14409.1005
CLRVersion 4.0.30319.17929
WSManStackVersion 3.0
PSRemotingProtocolVersion 2.3
SerializationVersion 1.1.0.1

Issue Description
Terminal does not work. outputing ERROR Exception
Exception encountered starting EditorServices. Exception logged in D:\a\1\s\src\PowerShellEditorServices.Hosting\Commands\StartEditorServicesCommand.cs on line 248 in EndProcessing:
System.MissingMethodException: Method not found: '!!0[] System.Array.Empty()'.
at Microsoft.PowerShell.EditorServices.Hosting.EditorServicesLoader.GetPSVersion()
at Microsoft.PowerShell.EditorServices.Hosting.EditorServicesLoader.LogPowerShellDetails()
at Microsoft.PowerShell.EditorServices.Hosting.EditorServicesLoader.LogHostInformation()
at Microsoft.PowerShell.EditorServices.Hosting.EditorServicesLoader.LoadAndRunEditorServicesAsync()
at Microsoft.PowerShell.EditorServices.Commands.StartEditorServicesCommand.EndProcessing()

== Press any key to close terminal ==

Attached Logs

21/09/2020 20:08:55 [NORMAL] - Visual Studio Code v1.49.1 32-bit
21/09/2020 20:08:55 [NORMAL] - PowerShell Extension v2020.6.0
21/09/2020 20:08:55 [NORMAL] - Operating System: Windows 32-bit
21/09/2020 20:08:55 [NORMAL] - Language server starting --
21/09/2020 20:08:55 [NORMAL] - PowerShell executable: C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
21/09/2020 20:08:55 [NORMAL] - PowerShell args: -NoProfile -NonInteractive -ExecutionPolicy Bypass -Command Import-Module 'c:\Users\Wuser.vscode\extensions\ms-vscode.powershell-2020.6.0\modules\PowerShellEditorServices\PowerShellEditorServices.psd1'; Start-EditorServices -HostName 'Visual Studio Code Host' -HostProfileId 'Microsoft.VSCode' -HostVersion '2020.6.0' -AdditionalModules @('PowerShellEditorServices.VSCode') -BundledModulesPath 'c:\Users\Wuser.vscode\extensions\ms-vscode.powershell-2020.6.0\modules' -EnableConsoleRepl -StartupBanner "=====> PowerShell Integrated Console v2020.6.0 <=====
" -LogLevel 'Normal' -LogPath 'c:\Users\Wuser.vscode\extensions\ms-vscode.powershell-2020.6.0\logs\1600711735-dcb2017c-f366-4915-b1e2-402c1ba6dd991600711712286\EditorServices.log' -SessionDetailsPath 'c:\Users\Wuser.vscode\extensions\ms-vscode.powershell-2020.6.0\sessions\PSES-VSCode-3096-381252' -FeatureFlags @()
21/09/2020 20:08:55 [NORMAL] - PowerShell Editor Services args: Import-Module 'c:\Users\Wuser.vscode\extensions\ms-vscode.powershell-2020.6.0\modules\PowerShellEditorServices\PowerShellEditorServices.psd1'; Start-EditorServices -HostName 'Visual Studio Code Host' -HostProfileId 'Microsoft.VSCode' -HostVersion '2020.6.0' -AdditionalModules @('PowerShellEditorServices.VSCode') -BundledModulesPath 'c:\Users\Wuser.vscode\extensions\ms-vscode.powershell-2020.6.0\modules' -EnableConsoleRepl -StartupBanner "=====> PowerShell Integrated Console v2020.6.0 <=====
" -LogLevel 'Normal' -LogPath 'c:\Users\Wuser.vscode\extensions\ms-vscode.powershell-2020.6.0\logs\1600711735-dcb2017c-f366-4915-b1e2-402c1ba6dd991600711712286\EditorServices.log' -SessionDetailsPath 'c:\Users\Wuser.vscode\extensions\ms-vscode.powershell-2020.6.0\sessions\PSES-VSCode-3096-381252' -FeatureFlags @()
21/09/2020 20:08:55 [NORMAL] - powershell.exe started.
21/09/2020 20:08:55 [NORMAL] - Waiting for session file
21/09/2020 20:12:56 [NORMAL] - Timed out waiting for session file to appear.
21/09/2020 20:12:56 [NORMAL] - Language server startup failed.
21/09/2020 20:12:56 [ERROR] - The language service could not be started:
21/09/2020 20:12:56 [ERROR] - Error: Timed out waiting for session file to appear.

[TylerLeonhardt]

@H1-N1 what version of the .NET Framework do you have installed? I think this will be fixed if you install v4.6 or higher.

[rjmholt]

Can you let us know the output of this:

Get-ItemProperty 'HKLM:\SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Full\'

[rjmholt]

For reference, we throw here and need to ensure net452 can run until here to get a clean message.

[H1-N1]

install .NET Framework v4.6 or higher

[sunilram-net]

Can you let us know the output of this:

Get-ItemProperty 'HKLM:\SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\Full\'

CBS : 1
Install : 1
InstallPath : C:\Windows\Microsoft.NET\Framework64\v4.0.30319
Release : 528372
Servicing : 0
TargetVersion : 4.0.0
Version : 4.8.04084
PSPath : Microsoft.PowerShell.Core\Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework
Setup\NDP\v4\Full
PSParentPath : Microsoft.PowerShell.Core\Registry::HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP\v4
PSChildName : Full
PSDrive : HKLM
PSProvider : Microsoft.PowerShell.Core\Registry