I mostly guess the following would have been the error.
Error using audioDeviceWriter/validatePropertiesImpl
No audio output device detected
Error in audioDeviceWriter/play
The app audioDelayEffectsExampleApp uses audioDeviceWriter to play the sound to the sound card. It belongs to Audio Toolbox and currently it is not supported in MATLAB Online.
I suggest you using a normal installed MATLAB version.Refer the following site for Installing MATLAB if you already not.
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