Communicate an error with the APP

I have created an app in app designer. It works well, but the only problem is stopping the app when an error occur. I have to run a function file from the app, so when there is an error in that function file, the information should be communicated with the app, so that the app can be stopped. Is there any way to do it.

Thank you.

[Walter Roberson]

try/catch and have the function file error() when it detects whatever condition ?

[Vasista Adupa]

Thank you that works great. But I didn't get "have the function file error()". Please elaborate. For now I am using this.

Try
Functionfilecalling
Catch
Error('error occured')
end

[Vasista Adupa]

Got it. Thank you.

Try
Functionfilecalling
Catch ME
rethrow(ME);
end

Answer 1

[Walter Roberson]

try
  Functionfilecalling
catch ME
    rethrow(ME);
end

function Functionfilecalling
   %example of something that generates an error
   [status, attr] = fileattrib(pwd);
   if ~status || attrib.UserWrite ~= 1
       error('You cannot write to the current directory');
   end
   %no error, do something
   fprintf('The rain in Spain is mainly in the plains.\n')
end