When I run the simulation, I am facing this problem.
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Saving external mode simulation output as a single object is not supported because the workspace variable 'out' is not created during model code execution. To suppress the warning, set 'ReturnWorkspaceOutputs' to 'off'.
Component:Simulink | Category:Model warning
Error occurred while executing External Mode MEX-file 'ext_comm': ExtTargetPktPending() call failed while checking for target pkt
Component:Simulink | Category:Block diagram error
Error occurred while executing External Mode MEX-file 'ext_comm': ExtSetTargetPkt() call failed on CLOSE. Ensure target is still running
Harshit Gupta on 3 Oct 2022
As mentioned by @Walter Roberson in the comments above, this error message indicates that Simulink was unable to communicate with the target board. One of the main reasons this can occur during run time of an external mode simulation is that the communication bandwidth usage is very high and communication can be momentarily lost. The following MATLAB Answers post has some suggestions on how to reduce the usage of the external mode communication in order to prevent this error: