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"Parametric Audio Equalizer for STM32 Discovery Boards" errors by pressing the "Monitor & turn" button.

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The errors returned are shown below:
External Mode Open Protocol Connect command failed
Caused by:
DWARF Parser internal error: Parser::describeSymbol xcpDummyDoubleVariable is not a global variable
Component:Simulink | Category:Block diagram error
Unable to connect to the 'STM32F746G-Discovery' target for 'stm32f746gdiscovery_audio_equalizer'.
Component:Simulink | Category:Model error
This project is loaded from "Embedded Coder Support Package for STMicroelectronics Discovery Boards".
If pressing "run" or "Build,Deploy & Start",there is no error returned.
If other modules are commented out and only input and output are left, as shown in the figure, this error message will still be reported. This problem will not appear on the stm32f4 disco development board. Note that stm32f4 uses an additional ttl-233.

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