Key not valid for use in specified state - A positional parameter cannot be found that accepts argument '+' - positional-parameter

Question

I am trying to understand what this error actually means. I am new to PowerShell and cannot
figure this one out. I have searched for similar questions but the content differs to my
requirement.
In a nut shell the script is queering a data historian system for a batch/lot number and the
start time of that batch.
This script will run every minute using task scheduler. This has not been set up yet as I am
still in the testing phase.
I have set up a service account is order for the script to run. The details of which are
stored in a cred file.
The script creates a folder using this batch/lot number.
The script creates a log file with the batch number and the start date and time of the batch.
Then the script searches a source folder on the server when a file is uploaded from the
factory floor into the source folder the script moves the file into the already created folder
with the correct batch number.
If files that are outside of the batch start and end time then the files are moved to no batch
folder where they will be reviewed manually.
I have done tests whereby I manually added files to the source folder on the server and
everything worked and did not get the "a positional parameter cannot be found that accepts
argument "+" from the script.
I am looking into the server configuration and permission levels but to my knowledge, nothing
has changed. I cannot see what is wrong with the script but hopefully, someone can give me
some pointers.
Error Code below
`PS C:\Users\a-graydx2> E:\Kistler Script\Batch ID with log 2021-11-29.ps1
An error occurred:
Key not valid for use in specified state.
Add-Content : A positional parameter cannot be found that accepts argument '+'.
At E:\Kistler Script\Batch ID with log 2021-11-29.ps1:186 char:11
+ Add-Content -Path $ErrorFileName -Value (Get-Date -Format " ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidArgument: (:) [Add-Content], ParameterBindingException
+ FullyQualifiedErrorId :
PositionalParameterNotFound,Microsoft.PowerShell.Commands.AddContentCommand
An error occurred:
Key not valid for use in specified state.
Add-Content : A positional parameter cannot be found that accepts argument '+'.
At E:\Kistler Script\Batch ID with log 2021-11-29.ps1:186 char:11
+ Add-Content -Path $ErrorFileName -Value (Get-Date -Format " ...
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : InvalidArgument: (:) [Add-Content], ParameterBindingException
+ FullyQualifiedErrorId :
PositionalParameterNotFound,Microsoft.PowerShell.Commands.AddContentCommand`
Script is below
Thanks for your help
`# Declare global variables
$fmSourcePath = "E:\Kistler\CoMo Services\Data\5336_L1.4345277\"
$shSourcePath = "E:\Kistler\CoMo Services\Data\5338_L1.5338_L1\"
$fmDesinationPath = "E:\Kistler XML Files\FM\"
$shDesinationPath = "E:\Kistler XML Files\SH\"
$fmWebAPI = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
$shWebAPI = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
# the path to stored credential
$credPath = "E:\Kistler Script\Cred.xml"
$logFileName = "BatchLog.txt"
#Path to the error log file
$ErrorFileName = "E:\Kistler Script\errorlog.txt"
function Move_Kistler_Files {
param (
[string]$url,
[string]$SourcePath,
[string]$DestinationPath
)
try {
# check for stored credential
if ( Test-Path $credPath ) {
#crendetial is stored, load it
$cred = Import-CliXml -Path $credPath
} else {
# no stored credential then: create store, get credential and save it
$parent = split-path $credpath -parent
if ( -not ( test-Path $parent ) ) {
New-Item -ItemType Directory -Force -Path $parent
}
$cred = get-credential
$cred | Export-CliXml -Path $credPath
}
# Get the current batch id using the Web-API call
$result = Invoke-RestMethod -Uri $url -Credential $Cred
$BatchID = $result.Value
$BatchFolder = $DestinationPath + $BatchID
Write-Host $BatchFolder
# Create a new folder in the destination path based on the Batch ID
If(!(test-path $BatchFolder))
{
New-Item -ItemType Directory -Force -Path $BatchFolder | Out-Null
# Add the current date/time to the log file
$LogFile = $DestinationPath + $logFileName
# if file exist Update the last record with the batch end date
If((test-path $LogFile)){
$txt = get-content $LogFile
$txt[$txt.length - 1 ] = $txt[$txt.length - 1 ] + ", " + (Get-Date)
$txt | set-content $LogFile
}else{
#add a header row in the file
Add-Content -Path $LogFile -Value "BatchID, StartDate, EndDate"
}
# create a new record in the log file with current Batch Id and date as start of
batch indicator
$msg = $BatchID + ", " + (Get-Date)
Add-Content -Path $LogFile -Value $msg
}
##############################################################################
# Copy the Kistler XML files from the source to the destination
##############################################################################
# get al the Kistler XML files in the source folder
$Files = get-childitem -path $SourcePath -Recurse | Where-Object {$_.Extension -eq ".XML"}
| Sort-Object LastWriteTime -Descending
# If we have files to process do it
if ($Files.Length -gt 0) {
# read back the batch start and end dates from the log table
$LogFile = $DestinationPath + $logFileName
$txt = get-content $LogFile
# Get the latest Batch Id and it's start date
$FileMoveCount = 0
$FileNotMoveCount = 0
$ptr = 1
$batchArray =$txt[$txt.length - $ptr ].Split(",")
$MoveToPath = $DestinationPath + $batchArray[0]
$batchStartDate = $batchArray[1]
#Process each XML file
Foreach ($File in $Files ) {
$FileTime = $File.LastWriteTime
#write-host $File.FullName $File.Name $FileTime $MoveToPath $batchStartDate
#if the XML file's date-time is older than the batch start time, skip to the
previus Batch Id and start time
while ( ([DateTime]$FileTime -lt [DateTime]$batchStartDate) -and ($ptr -lt
($txt.length)-1) ) {
#Write a log for the number of files copied
if ($FileMoveCount -gt 0){
Add-Content -Path $ErrorFileName -Value ((Get-Date -Format "dd/MM/yyyy
HH:mm") + ": " + $FileMoveCount + " XML files moved to " + $MoveToPath)
$FileMoveCount = 0
}
$ptr++
$batchArray =$txt[$txt.length - $ptr ].Split(",")
$MoveToPath = $DestinationPath + $batchArray[0]
$batchStartDate = $batchArray[1]
#write-host $MoveToPath $batchStartDate
}
#Copy the XML file to the destination folder
if ([DateTime]$FileTime -ge [DateTime]$batchStartDate){
Move-Item $File.FullName -Destination ($MoveToPath + "\" + $File.Name)
$FileMoveCount++
}else{
Move-Item $File.FullName -Destination ($DestinationPath + "\NoBatch\" +
$File.Name)
$FileNotMoveCount++
}
}
#Write a log for the number of files copied
if ($FileMoveCount -gt 0){
Add-Content -Path $ErrorFileName -Value ((Get-Date -Format "dd/MM/yyyy HH:mm") + ": "
+ $FileMoveCount + " XML files moved to " + $MoveToPath)
}
if ($FileNotMoveCount -gt 0){
Add-Content -Path $ErrorFileName -Value ((Get-Date -Format "dd/MM/yyyy HH:mm") + ":
Could not find batch ID for " + $FileNotMoveCount + " XML files " )
}
}
}catch{
#Write the error
Write-Host "An error occurred:" -ForegroundColor red
Write-Host $_ -ForegroundColor red
Add-Content -Path $ErrorFileName -Value (Get-Date -Format "dd/MM/yyyy HH:mm") + ": " +
$_
}
}
### Process the FM Kistler files
Move_Kistler_Files $fmWebAPI $fmSourcePath $fmDesinationPath
### Process the SH Kistler files
Move_Kistler_Files $shWebAPI $shSourcePath $shDesinationPath`