Weird error happens after suppress warnings in parfor workers

I searched online for how to suppress warnings in parfor workers, and i got the code like:

pctRunOnAll warning('off', 'all');   % supress warnings on all workers

and I added this statement in my function to start to parpool:

function startParpool()
    % import parallel profile and startup parpool workers
    if isempty(gcp('nocreate'))
        if isdeployed
            setmcruserdata('ParallelProfile', fullfile(ctfroot, '\config\MyDefaultProfile.settings'));
        end
        
        parpool(20);  % matches # of cores on ARMS server
    end
    
    pctRunOnAll warning('off', 'all');   % supress warnings on all workers
end

Everything is fine in Matlab IDE and the warnings during parfor are perfectly suppressed.

But after I compiled the program into application (using application compiler), I got this weird error when I run the application in command line:

what is the error Undefined function or variable 'parallel.internal.pool.interPPromptFcn' ??

(if i removed the above statement, the error will be gone, but the warnings are not suppressed.)

Answer 1

[Owen Zhang]

i worked it out, i don't know why pctRunOnAll warning('off', 'all'); is not working.

but just simply add warning('off', 'all'); at the beginning of parfor loop.

[Chien-Han Su]

This works for me in R2018a under Win10. Thanks!