Can somebody help me with Ultrasim toolbox?

I'm trying to see the 2D response of examples (.cnf) using Ultrasim toolbox, and it gives me the following error:

*Error using datetime/horzcat (line 1210) Could not automatically convert the string 'ARRAY-RESPONSE' to a datetime value because its format was not recognized.

Error in petxt (line 242) Ttxt1 = ['ARRAY-RESPONSE',' ',fig_txt,' ',datetime];

Error in peplot (line 159) petxt(excitation,media,transducer,option,flagg,z,t, ...

Error using eusim (line 60) Error while evaluating Menu Callback*

What could be the cause?

Regards