Created Unassigned: You cannot call a method on a null-valued expression [54277]

I receive this error during the create charts execution (See below)
I have attached the output of the script as well.

Things to note:
* Perfmon blg file is the sample provided
* Running this on a Windows 8.1 environment
*

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Error:
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Overall progress... Status: Applying thresholds, PAL 2.7.1 Progress: 82.3529411764706%... Applying thresholds, Memory Pages/sec

An error occurred on...
If (($htVariables["CollectionOfAvailableMBytes"][$a].QuantizedMin[$t] -ne '-') -and ($htVariables["CollectionOfAvailableMBytes"][$a].QuantizedMin[$t] -ne $null) -and ($htVariables["CollectionOfMemoryPagessec"][$i].QuantizedAvg[$t] -ne $null) -and ($htVariables["CollectionOfMemoryPagessec"][$i].QuantizedAvg[$t] -ne $null))
At line:21 char:17 + If (($htVariables["CollectionOfAvailableMBytes"][$a].QuantizedMin[$t ... + ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
The property 'QuantizedAvg' cannot be found on this object. Verify that the property exists.


SCRIPT ARGUMENTS:
Log: C:\Tools\Performance Analysis\PAL\PAL_flatfiles_v2.7.1_x64\PAL\SamplePerfmonLog.blg
ThresholdFile: C:\Tools\Performance Analysis\PAL\PAL_flatfiles_v2.7.1_x64\PAL\SystemOverview.xml
AnalysisInterval: AUTO
IsOutputHtml: $True
IsOutputXml: $False
HtmlOutputFileName: [LogFileName]_PAL_ANALYSIS_[DateTimeStamp].htm
XmlOutputFileName: [LogFileName]_PAL_ANALYSIS_[DateTimeStamp].xml
OutputDir: [My Documents]\PAL Reports
AllCounterStats: $False
NumberOfThreads: 4
IsLowPriority: $True
DisplayReport: True
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