FIT CONTRIBUTIONS LIMIT

Is there a fit contributions limit??

i noticed that when i use 15 works on simulator but not on device

it shows me this

Error Name: System Error
Occurrences: 3
First Occurrence: 2020-10-11
Last Occurrence: 2020-10-11
Devices:
Edge® 530: 6.20
App Versions: 1.6.5
Languages: eng
Backtrace:
PowerEdgeProView.initialize:146
PowerEdgeProApp.getInitialView:19

146 is this line

		tss = createField(Ui.loadResource(Rez.Strings.TSS), 9, FitContributor.DATA_TYPE_FLOAT, { :mesgType=>FitContributor.MESG_TYPE_SESSION, :units=>Ui.loadResource(Rez.Strings.NU) }); 
		tss.setData(TSS);


thanks