Unable to run traces in ebFRET

[ananyagithub1]

I start gui with
ebf= ebFRET()
and able to load trace files (.dat files) and all traces come in a new window. But when I press run option to analyse , error is coming in MATLab and it is unable to run the programme. Below are the error coming in MATLAB:

_Error using ebfret.analysis.dist.dirichlet.rand (line 25)
Undefined function 'gamrnd' for input arguments of type 'double'.

Error in ebfret.analysis.hmm.init_posterior (line 76)
theta.pi = ebfret.analysis.dist.dirichlet.rand(u.pi);

Error in ebfret.ui.MainWindow/run_vbayes (line 69)
parfor n = ns

Error in ebfret.ui.MainWindow/run_ebayes (line 126)
self.run_vbayes(...

Error in ebfret.ui.MainWindow/set_control (line 252)
self.run_ebayes();

Error in ebfret.ui.MainWindow/analysisRunStopButtonCallBack (line 499)
self.set_control('run_analysis', 1);

Error in ebfret.ui.MainWindow>@(source,event)self.analysisRunStopButtonCallBack(source,event) (line 262)
self.analysisRunStopButtonCallBack(source, event), ...

Error while evaluating UIControl Callback._

I use same version of MATLab and ebFRET few days before, then it worked nicely. But now I am suddenly facing this problem. Unable to catch up the problem.