Added stop with error

Test-ParametersAndPrompts.ps1

function Test-ParametersAndPrompts {
    [cmdletbinding()]
    param(
        [parameter(Position = 0, HelpMessage = 'Enter the location of the folder.')]
        [ValidateScript({ Test-Path -Path $_ })]
        [Alias('PSPath')]
        [string]
        $Path,

        [parameter(Position = 1, HelpMessage = 'Enter a number from 1 to 10.')]
        [ValidateRange(1, 10)]
        [Alias('RandomNumber')]
        [int]
        $Number,

        [parameter(Position = 2, HelpMessage = 'Choose a set of Set1, Set2, or Set3.')]
        [ValidateSet('Set1', 'Set2', 'Set3')]
        [Alias('Option', 'Choose')]
        [string]
        $Set
    )

    process {
        switch ($PSBoundParameters) {
            { $_.Keys -notcontains 'Path'   } {
                Try {
                    $Path = Read-Host -Prompt 'Enter the location of the folder.' -ErrorAction Stop
                } catch {
                    Write-Error $error[0]
                    return
                }
            }
            { $_.Keys -notcontains 'Number' } {
                try {
                    $Number = Read-Host -Prompt 'Enter a number from 1 to 10.'  -ErrorAction Stop
                } catch {
                    Write-Error $error[0]
                    return
                }
            }
            { $_.Keys -notcontains 'Set'    } {
                Try {
                    $Set = Read-Host -Prompt 'Choose a set of Set1, Set2, or Set3.' -ErrorAction Stop
                } catch {
                    Write-Error $error[0]
                    return
                }
            }
        }

        [PSCustomObject]@{
            Path = $Path
            Number = $Number
            Set = $Set
        }
    }
}