Cannot convert argument "value", with value: "", for "AddDays" to type "System.Double":

[bezik46]

Cannot convert argument "value", with value: "10675199.02:48:05.4775807", for "AddDays" to type "System.Double":
"Cannot convert the "10675199.02:48:05.4775807" value of type "System.TimeSpan" to type "System.Double"."
At C:\PSScripts\PSHTML-AD.ps1:946 char:4
+             $expireson = $passwordsetdate.AddDays($maxPasswordAge)
+             ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    + CategoryInfo          : NotSpecified: (:) [], MethodException
    + FullyQualifiedErrorId : MethodArgumentConversionInvalidCastArgument