Windows-Based Simple PowerShell Scriptwriter

PowerShell coder

simple one-line code -- and/or fix system Windows 11

Was using:
Get-Content *.csv | Set-Content merged.csv

But now strangely is not working,

Getting this error message:

Set-Content : An object at the specified path merged.csv does not exist, or has been filtered by the -Include or
-Exclude parameter.
At line:1 char:21
+ Get-Content *.csv | Set-Content merged.csv
+ ~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : ObjectNotFound: (System.String[]:String[]) [Set-Content], Exception
+ FullyQualifiedErrorId : ItemNotFound,Microsoft.PowerShell.Commands.SetContentCommand

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Example CSV data files attached