How to fix "Error occurred while executing External Mode MEX-file 'ext_comm': ExtTargetPktPending() call failed while checking for target pkt" ?

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Tina
Tina 2018-3-7
Hi, I have a very simple simulink model. I want to read the signal at some analog and digital inputs and show them in a display and scope. I also put some PWM signals to two digital output pins. Additionally, I include a c-function to my model with a matlab function. So far, everything is working but if I want to reduce the step size in the model configurations from 0.001 to 0.0001 I get the following errors:
Error occurred while executing External Mode MEX-file 'ext_comm': ExtTargetPktPending() call failed while checking for target pkt
Error occurred while executing External Mode MEX-file 'ext_comm': ExtSetTargetPkt() call failed on CLOSE. Ensure target is still running
I am using a ARDUINO UNO Board and the build process can be completed successfully.
Does anybody know how to fix this errors?
Thanks for your answers!

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