Problem using exiflib

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VB

I'm trying to use the exiflib library

i have this code

Dim reader As ExifReader
     reader = New ExifReader(naam)
     Dim latitudeDMS As Double
     Dim longitudeDMS As Double
     Dim longitudeRef As String
     Dim latitudeRef As String
     Dim dateTaken As DateTime
     Dim succes As Boolean

     succes = reader.GetTagValue(ExifTags.GPSLatitude, latitudeDMS)
     succes = reader.GetTagValue(ExifTags.GPSLongitude, longitudeDMS)
     succes = reader.GetTagValue(ExifTags.GPSLatitudeRef, latitudeRef)
     succes = reader.GetTagValue(ExifTags.GPSLongitudeRef, longitudeRef)
     succes = reader.GetTagValue(ExifTags.DateTimeDigitized, dateTaken)

with the first 2 statements
succes = reader.GetTagValue(ExifTags.GPSLatitude, latitudeDMS)
succes = reader.GetTagValue(ExifTags.GPSLongitude, longitudeDMS)

I get this error

An unhandled exception of type 'System.InvalidCastException' occurred in ExifLib.dll

Additional information: Specified cast is not valid.

the other 3 statements work fine.
What am I doing wrong? is double the wrong type ? or is there a problem in the exiflib library?


many thanks in advance

Schenck