I am trying to read an analog signal using arduino uno in simulink and I am getting the following error :

=== Simulation (Elapsed: 0.460 sec) ===

Error:MATLAB System block 'untitled/Analog Input' error occurred when invoking 'setupImpl' method of 'codertarget.arduinobase.internal.arduino_AnalogInput'. The error was thrown from '

'K:\softwares\Matlab installed\toolbox\matlab\serial\@serial\fieldnames.m' at line 13

'K:\softwares\Matlab installed\toolbox\shared\instrument\@instrument\instrument.p' at line 0

'C:\ProgramData\MATLAB\SupportPackages\R2018a\toolbox\target\shared\ioserver\+matlabshared\+ioclient\+transport\TransportLayerAbstract.p' at line 0

'C:\ProgramData\MATLAB\SupportPackages\R2018a\toolbox\target\shared\ioserver\+matlabshared\+ioclient\IOProtocol.p' at line 0

'C:\ProgramData\MATLAB\SupportPackages\R2018a\toolbox\target\shared\ioserver\+matlabshared\+ioclient\IOProtocol.p' at line 0

'C:\ProgramData\MATLAB\SupportPackages\R2018a\toolbox\target\shared\ioserver\+matlabshared\+ioclient\+peripherals\AnalogInput.p' at line 0

'C:\ProgramData\MATLAB\SupportPackages\R2018a\toolbox\target\supportpackages\arduinobase\+codertarget\+arduinobase\+internal\arduino_AnalogInput.p' at line 0

'C:\ProgramData\MATLAB\SupportPackages\R2018a\toolbox\target\shared\svd\+matlabshared\+svd\AnalogInSingle.p' at line 0

'K:\softwares\Matlab installed\toolbox\shared\spcuilib\slscopes\+Simulink\+scopes\+source\@WiredSource\sendSimulationCommand.m' at line 13

'K:\softwares\Matlab installed\toolbox\shared\spcuilib\unifiedscopes\@uiservices\fevalNoBacktrace.m' at line 10

'K:\softwares\Matlab installed\toolbox\shared\spcuilib\slscopes\+Simulink\+scopes\+source\@WiredSource\sendSimulationCommand.m' at line 13

'K:\softwares\Matlab installed\toolbox\shared\spcuilib\slscopes\+Simulink\+scopes\+source\@PlaybackControls\slPlayPause.m' at line 35

'K:\softwares\Matlab installed\toolbox\shared\spcuilib\slscopes\+Simulink\+scopes\+source\@PlaybackControls\PlaybackControls.m' at line 547'.

Caused by:

Instrument object OBJ is an invalid object.