Edited Issue: Method invocation failed because [System.String] doesn't contain a method named 'GetUpperBound'. [25040]

Am getting the below error message and aborted the PAL execution.
Can any one suggest what is to be done on this.

Threshold File Load History:
C:\Program Files\PAL\PAL\SystemOverview.xml
QuickSystemOverview.xml

Generating the counter list to filter on...Done
Removing duplicate counter expressions from counter list...Done

All counter stats is set to true. Loading all counters in perfmon log into the t
hreshold file as new analyses. This may take several minutes.
Getting the counter list from the perfmon log...Done
Importing the counter list as new threshold analysesWARNING: Please post errors
or problems with this tool to the PAL web site
located at http://www.codeplex.com/PAL with the following error message and a
brief description of what you were trying to do. Thank you.
Method invocation failed because [System.String] doesn't contain a method named
'GetUpperBound'.
At C:\Program Files\PAL\PAL\PAL.ps1:1807 char:66
+ For ($i=0;$i -lt $global:aCounterLogCounterList.GetUpperBound <<<< (0);$i
++)
+ CategoryInfo : InvalidOperation: (GetUpperBound:String) [], Par
entContainsErrorRecordException
+ FullyQualifiedErrorId : MethodNotFound

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