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Thursday, February 2, 2023

PowerShell 7.2.0 – Could not load type System.Management.Automation.Subsystem.PredictionResult


My PowerShell upgraded to the new PowerShell 7.2.0 and it happened automatically since I get PowerShell from the Windows Store. However, my fancy prompt use PSReadLine with Predictive Autocomplete stopped working suddenly.

However, suddenly I started getting this error on every prompt.

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)

Well, you can see I’m using a Beta of PSReadLine 2.2:

### Environment
PSReadLine: 2.2.0-beta2
PowerShell: 7.2.0

But I have failed to keep it up to date, and when I got into this state, I realized just because my prompt wasn’t pretty (momentarily) I could update it with one line while still staying on the Beta Train.

Install-Module PSReadLine -AllowPrerelease -Force

Now I’m on 2.2.0-beta4 and all is well and I have my cool prediction history back!


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About Scott

Scott Hanselman is a former professor, former Chief Architect in finance, now speaker, consultant, father, diabetic, and Microsoft employee. He is a failed stand-up comic, a cornrower, and a book author.

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