Report working on Jet 2012 but not on Jet 2013...

Hi,

I've a simple report working on JetReports 2012 but not on JetReports 2013. I'm using simple function like NL("Rows"… and NL("Sum"…
I' really don't know what's the problem.

Is there any difference with those function depending on the version of JetReports ?

Thank you.