how to change 'StartTime' while training RL algorithm in Simulink environment

hello, maybe somebody can help me,

I feed weather datafile (8761 x 19 table of annual weather data, recorded with 3600s timestep) to the Simulink model of a solar collector. To make the algorithm learn from the different data, I would like to reset 'StartTime' for each training episode (24 hours) in such a way, the episode starts at random time in the range of a year: (0, 364*24*3600).

I tried to use set_param to set 'StartTime'. Below is the code in LocalResetFcn.m:

function in = localResetFcn(in)
in = set_param(in,'simulink_model','StartTime','3600*24*randi(364)');
end

it's not working and the errors are:

What can you advise to solve this?

[Pavel Semenov]

I can manage it in the model without RL agent, by writing in Callbacks >InitFcn:

set_param('modelname','StartTime','3600*24*randi(365)')

but when I apply this for RL model, it gives the error message " localHandleSimoutErrors":

Error

Caused by:

Error using rl.env.SimulinkEnvWithAgent>localHandleSimoutErrors (line 689)

Invalid StopTime specified in the Configuration Parameters dialog for block diagram 'modelname '

I specified Start and stop time as follows: