"Expected u to be a scalar" Error

So, i tried to run this Simulink code, then i got this error:

MATLAB System block 'arduino_project/LED Red' error occurred when invoking 'validateInputsImpl' method of 'codertarget.arduinobase.blocks.DigitalWrite'. The error was thrown from ' 'C:\ProgramData\MATLAB\SupportPackages\R2020b\toolbox\target\supportpackages\arduinobase\+codertarget\+arduinobase\+blocks\DigitalWrite.p' at line 0 'E:\Apps\MatLab2020b\toolbox\shared\spcuilib\slscopes\+Simulink\+scopes\+source\@WiredSource\sendSimulationCommand.m' at line 13 'E:\Apps\MatLab2020b\toolbox\shared\spcuilib\unifiedscopes\@uiservices\fevalNoBacktrace.m' at line 10 'E:\Apps\MatLab2020b\toolbox\shared\spcuilib\slscopes\+Simulink\+scopes\+source\@WiredSource\sendSimulationCommand.m' at line 13 'E:\Apps\MatLab2020b\toolbox\shared\spcuilib\slscopes\+Simulink\+scopes\+source\@PlaybackControls\slPlayPause.p' at line 0 'E:\Apps\MatLab2020b\toolbox\shared\spcuilib\slscopes\+Simulink\+scopes\+source\@PlaybackControls\PlaybackControls.p' at line 0'.

Caused by:

• Expected u to be a scalar.

Anyone know what should i do?

[Walter Roberson]

Somehow the output of the flame sensor is not a scalar

[Tufail Ahmad Bhat]

Did you solve it?

[Walter Roberson]

I just noticed that the thermal sensor is compared to a value, and combined on a bus with a boolean, producing a bus with two booleans, and that bus is being sent to arduino digital output. But arduino digital output is expecting a scalar not a bus.