Hi, @Berke_E,
First of all, what version of toolbox are you using and with what version of MATLAB?
Generally, the error you encountered occurs when the board is not connected correctly or is not turned on. But from what you say, the board is connected and functional.
From what I can see from the screenshot you provided, your model seems to have reset all its block settings to the first option (RGBLED0_BLUE), which is why you have the 3 warnings. This may mean that some settings in the model configuration were not compliant. What I recommend is to try to do a cleanup (by deleting the s32k3xx_dio_ebt_TresosProject folder and reopening the model example) and try downloading again.
It would also be interesting to mention if you have other debugger tools connected to the laptop, in which case conflicts may occur in the download mode.
Also, a picture of your board would be helpful so we can see any improper jumper connections.
Best regards,
Dragos