[Zope] Error Value: not all arguments converted

[Alexander Alvarado]

I'm traying to convert variables that I recieve from a JavaScript tu ISO 
date format using:

   <dtml-var Arrival fmt=ISO>
   <dtml-var Departure fmt=ISO>

This Dates will be then used to send an SQL request to a database so I use:

<dtml-in expr="Disponibilidad_cal (fechain=Arrival, fechaout=Departure)">

And allways shows same error:

Zope has encountered an error while publishing this resource.

Error Type: TypeError
Error Value: not all arguments converted

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I have no idea of what am I doing wrong, can anybody help me?

Thanks

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