SOAPUI convert request parameter getting from properties

i got GET request where i need to fill in parameter: GET: myservice/getMethod/parameter1(Long data type)

on SoapUI i kept it on properties: name: parameter1 value: value of my parameter1(in SoapUI 'value' is String data type)

if i called GET which expected long but getting string i got an error "Failed to convert value of type 'java.lang.String' to required type 'java.lang.Long'; nested exception is java.lang.NumberFormatException: For input string: "\parameter1"

I tried to convert it like below by groovy but still same error:

def string = context.expand( '${Properties#parameter1}' )
Long longValue = string.toLong()
context.setProperty("parameter1",longValue )

Pls help :( Thx a lot.