I understand that you are receiving an error while trying to run ADLAM-Pluto example in Simulink.
Upon reviewing the screenshot shared, One possible reason for the error you're experiencing is that you might be running the 'Receiver' example without a corresponding "Transmitter" running simultaneously. Without an active transmitter, there is no data available for the 'Receiver' to receive.
For more detailed information, please refer to the 'Running the Example' section in the following documentation:
The above example provides comprehensive instructions to ensure correct setup for both the Transmitter and Receiver.
I hope this helps.