Assertion failed using particle filter

I am using Matlab particle filter (particlefilter) for a power system state estimation which is IEEE5 bus system. When i run the code, I get the following error after some iterations:

%Error using matlabshared.tracking.internal.StateEstimator/assertPreconditions (line 44)

%Assertion failed.

%Error in matlabshared.tracking.internal.MeanStateEstimator/estimate (line 42)

% obj.assertPreconditions(particleManager, particles, weights, isCircVar);

%Error in matlabshared.tracking.internal.ParticleFilter/getStateEstimate (line 626)

% stateEst = obj.StateEstimator.estimate(...

%Error in matlabshared.tracking.internal.ParticleFilter/correct (line 586)

stateCorr = obj.getStateEstimate;

%Error in main (line 67)

xEst(k,:) = correct(myPF,yMeas(k,:));

and this my code:

myPF = particleFilter(@ieee5_statefunctions,@ieee5_likelihood);
initialize(myPF,1000,[ 1; 0 ; 0 ; 1 ; 0 ; 0 ; 1 ; 0 ; 0 ; 1 ; 0 ; 1 ; 0], eye(13));
myPF.StateEstimationMethod = 'mean';
myPF.ResamplingMethod = 'systematic';
xEst = zeros(size(xTrue));
for k=1:size(xTrue,1)
    xEst(k,:) = correct(myPF,yMeas(k,:));
    predict(myPF);
end

my guess is after some iterations the estimated numbers get so big that causes error but I can't find where is my problem. I hope someone could help me.