Why is it that when I add an agent to simulink, I get an error indicating that I cannot change the properties

When I open an official case, such as by comparing pid and ddpg to control the height of water in the tank, the official original file can be run. But when I will remove the agent of the official case and manually add an "agent" myself, after clicking "Run" in the mlx file, the following error will be reported

ill usage rl.train.SeriesTrainer/run

'RL_dianyesifu_DDPG_test/RL Agent' 中出错: 无法计算封装初始化命令。

error rl.train.TrainingManager/train (第 479 行)

run(trainer);

erro rl.train.TrainingManager/run (第 233 行)

train(this);

erro rl.agent.AbstractAgent/train (第 136 行)

trainingResult = run(trainMgr,checkpoint);

reason:

ill usage rl.env.internal.reportSimulinkSimError

This cannot be changed while the simulation is running 'rlwatertank/RL Agent/RL Agent' the stats of 'Tunable'

I am a beginner, please give me some advice, thank you！

[Emmanouil Tzorakoleftherakis]

Did you update the agent variable everywhere? Make sure to update it on the RL Agent block in the Simulink model as well