Odd error after running for 6+ hours

Session Open   - 08/30/2024 06:31:20
Synching files for <removed>...
Exception calling "SynchronizeDirectories" with "7" argument(s): "Error formatting a string: Index (zero based) must be greater than or equal to zero and less than the size of the argument list.."
Session Closed - 08/30/2024 12:47:55
Time difference: 0 days, 6 hours, 16 minutes, 36 seconds

. 2024-08-30 12:47:53.253 File: '<removed>' [2021-04-25T09:11:46.796Z] [0]
. 2024-08-30 12:47:53.253 Listing file "<removed>".
. 2024-08-30 12:47:53.332 Creating directory "<removed>".
. 2024-08-30 12:47:53.332 Canonifying: "<removed>"
. 2024-08-30 12:47:53.441 Canonified: "<removed>"
. 2024-08-30 12:47:53.644 File: '<removed>' [2020-04-29T17:49:32.000Z] [14412304]
. 2024-08-30 12:47:54.910 Copying "<removed>" to remote directory started.

function FileTransferProgress {
   param ($e)
   Write-Progress -Id 0 -Activity "Synching" -CurrentOperation ("$($e.FileName) - {0:P0}" -f $e.FileProgress) -Status ("{0:P0} complete at $($e.CPS) bps" -f $e.OverallProgress) -PercentComplete ($e.OverallProgress * 100)
}

$session.add_FileTransferProgress( { FileTransferProgress($_) } )

function FileTransferProgress {
param ($e)
   try {
        # Escape each special character's
        $Escaped_Filename = $e.FileName -replace '\{', '{{' -replace '\}', '}}'
 
        $Current_FileProgress = $e.FileProgress
        $Current_CPS = $e.CPS
        $Current_OverallProgress = $e.OverallProgress
 
        Write-Progress -Id 0 -Activity "Synching" -CurrentOperation ("$Escaped_Filename - {0:P0}" -f $Current_FileProgress) -Status ("{0:P0} complete at $Current_CPS bps" -f $Current_OverallProgress) -PercentComplete ($Current_OverallProgress * 100)
   }
   catch {
        Write-Host "Error Hit in FileTransferProgress"
        Write-Host "Escaped_Filename: $Escaped_Filename"
        Write-Host "Current_FileProgress: $Current_FileProgress"
        Write-Host "Current_CPS: $Current_CPS"
        Write-Host "Current_OverallProgress: $Current_OverallProgress"
   } 
}

function FileTransferProgress {
    param ($e)
    try {        
        $Filename = $e.Filename
        $FileProgress = $e.FileProgress
        $CPS = $e.CPS
        $OverallProgress = $e.OverallProgress
    
        if ($Filename -match '^[\u0000-\uFFFF]+$') {
            # Display progress for ASCII filenames
            Write-Progress `
                -Id 0 `
                -Activity "Synching" `
                -Status "$($OverallProgress.ToString('P0')) complete at $CPS bps" `
                -PercentComplete ($OverallProgress * 100) `
                -CurrentOperation "$Filename - $($FileProgress.ToString('P0'))"
        }
        else {
            Write-Host "The string is not Unicode."
            Write-Host "Filename is $Filename"
        }
    }
    catch {
        Write-Host "Function: FileTransferProgress"
        Write-Host ""
        Write-Host '  Attempting Variable Output: $_'
        Write-Host $_
        Write-Host ""
        Write-Host "  Additional Error Info:"
        Write-Host "    Error in script: $($_.InvocationInfo.ScriptName)"
        Write-Host "    Error on line: $($_.InvocationInfo.ScriptLineNumber)"
        Write-Host "    Error message: $($_.Exception.Message)"
        Write-Host "    Error Hit in FileTransferProgress"
        Write-Host "    Filename: $Filename"
        Write-Host "    FileProgress: $FileProgress"
        Write-Host "    CPS: $CPS"
        Write-Host "    OverallProgress: $OverallProgress"
    } 
}