WARNING: sum of coefficients is zero 0

RooAbsTestStatistic::initSimMode: creating slave calculator #2058 for state 24722 (19 dataset entries) [#1] INFO:NumericIntegration -- RooRealIntegral::init(U235SpectrumFunc_Int[NeutrinoEnergy|IntegralRange]_Norm[NeutrinoEnergy]) using numeric integrator RooIntegrator1D to calculate Int(NeutrinoEnergy) [#1] INFO:NumericIntegration -- RooRealIntegral::init(U238SpectrumFunc_Int[NeutrinoEnergy|IntegralRange]_Norm[NeutrinoEnergy]) using numeric integrator RooIntegrator1D to calculate Int(NeutrinoEnergy) [#1] INFO:NumericIntegration -- RooRealIntegral::init(Pu239SpectrumFunc_Int[NeutrinoEnergy|IntegralRange]_Norm[NeutrinoEnergy]) using numeric integrator RooIntegrator1D to calculate Int(NeutrinoEnergy) [#1] INFO:NumericIntegration -- RooRealIntegral::init(Pu241SpectrumFunc_Int[NeutrinoEnergy|IntegralRange]_Norm[NeutrinoEnergy]) using numeric integrator RooIntegrator1D to calculate Int(NeutrinoEnergy) [#0] WARNING:Eval -- RooAddPdf::updateCoefCache(Reactor1Pdf) WARNING: sum of coefficients is zero 0 [#0] WARNING:Eval -- RooAddPdf::updateCoefCache(Reactor2Pdf) WARNING: sum of coefficients is zero 0 [#0] WARNING:Eval -- RooAddPdf::updateCoefCache(TotalNeutrinoPDF) WARNING: total number of expected events is 0 [#0] WARNING:Eval -- RooAddPdf::updateCoefCache(Reactor1Pdf) WARNING: sum of coefficients is zero 0 [#0] WARNING:Eval -- RooAddPdf::updateCoefCache(Reactor1Pdf) WARNING: sum of coefficients is zero 0 [#0] WARNING:Eval -- RooAddPdf::updateCoefCache(Reactor1Pdf) WARNING: sum of coefficients is zero 0 [#1] INFO:NumericIntegration -- RooRealIntegral::init(U235Spectrum_Int[NeutrinoEnergy]) using numeric integrator RooIntegrator1D to calculate Int(NeutrinoEnergy) [#1] INFO:NumericIntegration -- RooRealIntegral::init(U238Spectrum_Int[NeutrinoEnergy]) using numeric integrator RooIntegrator1D to calculate Int(NeutrinoEnergy) [#1] INFO:NumericIntegration -- RooRealIntegral::init(Pu239Spectrum_Int[NeutrinoEnergy]) using numeric integrator RooIntegrator1D to calculate Int(NeutrinoEnergy) [#1] INFO:NumericIntegration -- RooRealIntegral::init(Pu241Spectrum_Int[NeutrinoEnergy]) using numeric integrator RooIntegrator1D to calculate Int(NeutrinoEnergy) [#0] WARNING:Eval -- RooAddPdf::updateCoefCache(Reactor2Pdf) WARNING: sum of coefficients is zero 0 [#0] WARNING:Eval -- RooAddPdf::updateCoefCache(Reactor2Pdf) WARNING: sum of coefficients is zero 0 [#0] WARNING:Eval -- RooAddPdf::updateCoefCache(Reactor2Pdf) WARNING: sum of coefficients is zero 0

I have a roosimultaneous of 6000 runs but I don’t get these errors when I only use 200 or so runs. Anyone know what is going on? Thank you.