Index was outside the bounds of the array error when processing .svd file - powershell

Question

clear
# Powershell scripts used to mask Private Personal Information on data files.
# path to PERM file
$path = "MYURL\ABS.SVD"
# get file content
$content = Get-Content $path
$content | ForEach-Object {
$mask50 = 'X' * 50 # variables to makes fields by letter according to length
$mask30 = 'Y' * 30
$mask20 = 'A' * 20
$mask08 = 'Z' * 8
$mask05 = 'B' * 5
$mask16 = 'C' * 16
# if statement, if the string is at position 0-10, and begins with
# 'STARTDELIV' then run replace statement
if ($_.Substring(0,10) -eq 'STARTDELIV') {
$SplitString = $_.Split('|')
$SplitString[3] = $mask30 # Fields : To Fax Name
$SplitString[4] = $mask20 # Fields : To fax Number
$SplitString[9] = $mask50 # Fields : To EMail Address
$SplitString -join '|'
} else {
$_
}
} | Out-File "MYURL\ABS-Output.svd" -Encoding ASCII
I have a script which masked certain fields in a data file (fields seperated by '|'). I have done a lot of these and they work fine. However, when I copy this exact file to another folder to use a different data file (.svd) I get the "Index was outside the bounds of the array", I've seen a few other threads on this but none really answer my query.
Curious as to why it still works in a particular folder location but not the other (I am changing the input and output urls to direct to the new folder).
Error below:
Index was outside the bounds of the array.
AtMYURL-Masked-Fields.ps1:28 char:3
+ $SplitString[3] = $mask30 #To Fax Name
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : OperationStopped: (:) [], IndexOutOfRangeException
+ FullyQualifiedErrorId : System.IndexOutOfRangeException

Answer 1

Answer provided by #lit
"There is at least one record starting with STARTDELIV that does not have enough fields. find /I "STARTDELIV" "MYURL\ABS.SVD" "