Euler ERROR - where is it coming from?

Roofit and RooStats
1

Dear experts,

I get a rare error and I don’t understand the source:
Euler ERROR: -8.736567025e-12

How can I find the source code line that leads to this error?

ROOT 5.27/06b

Thanks,
Dima

2

Never mind, it was not ROOT code. Sorry for noise.