Created Unassigned: does not contain a method [25688]

Method invocation failed because [System.Double] does not contain a method
named 'GetUpperBound'.
At C:\Program Files\PAL\PAL\PAL.ps1:3470 char:73
+ $Trend = $(ConvertToDataType -ValueAsDouble
$alQuantizedTrendValues[$($alQuant ...
+
~~~~~~~~
+ CategoryInfo : InvalidOperation: (:) [], ParentContainsErrorRec
ordException
+ FullyQualifiedErrorId : MethodNotFound