I want to get simple data field. From my document and I don't know why this function don't work all is fine with document ... when I'm calling this:

 

var data = collection_name.getItemValueCustomData("form_field");

 

I got such an exception:

 

Error while executing JavaScript action expression
Script interpreter error, line=17, col=48: [TypeError] Exception occurred calling method NotesDocument.getItemValueCustomData(string) invalid stream header: 80EE3600
invalid stream header: 80EE3600

 

I want to use later timeDifference() and I need to have variable in date format