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Powershell 7.5.4.0 does not start "Could not load type 'System.Management.Automation.Subsystem.PredictionResult' " #5097
Description
I am on Win 11 Pro Version 10.0.26200 Build 26200. The OS is up to date.
I just loaded Powershell 7.5.4.0, using winget, as per the instructions here :
It does not run, and shows this message when I start it :
Oops, something went wrong.
Please report this bug with ALL the details below, including both the 'Environment' and 'Exception' sections.
Please report on GitHub: https://github.com/PowerShell/PSReadLine/issues/new?template=Bug_Report.md
Thank you!
Environment
PSReadLine: 2.2.0-beta2
PowerShell: 7.5.4
OS: Microsoft Windows 10.0.26200
BufferWidth: 120
BufferHeight: 30
Last 0 Keys
Exception
System.TypeLoadException: Could not load type 'System.Management.Automation.Subsystem.PredictionResult' from assembly 'Microsoft.PowerShell.PSReadLine.Polyfiller, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null'.
at Microsoft.PowerShell.PSConsoleReadLine.PredictionViewBase.Reset()
at Microsoft.PowerShell.PSConsoleReadLine.PredictionInlineView.Reset()
at Microsoft.PowerShell.PSConsoleReadLine.Prediction.Reset()
at Microsoft.PowerShell.PSConsoleReadLine.Initialize(Runspace runspace, EngineIntrinsics engineIntrinsics)
at Microsoft.PowerShell.PSConsoleReadLine.ReadLine(Runspace runspace, EngineIntrinsics engineIntrinsics, CancellationToken cancellationToken)
Activity
github-actions commentedon Feb 23, 2026
This issue was fixed in 2.2.0-beta3 version of PSReadLine. You can fix this by upgrading to the latest 2.3.5 version of PSReadLine.
To upgrade, simply run
Install-Module PSReadLine -AllowPrerelease -Forcefrom your PowerShell console.If you want to remove that beta version of PSReadLine and use the 2.1.0 version of PSReadLine that's shipped with PowerShell 7.2, you can:
pwsh -noprofile -noninteractiveto startpwshwithout loading PSReadLineUninstall-Module -Name PSReadLine -RequiredVersion <2.2.0-beta1 or 2.2.0-beta2> -AllowPrereleaseto remove the module. Or, you can manually remove that module folder.