How can I detect the number of circles on the picture on MATLAB?

I'm working to detect the number of circles on the picture with the following tips. imfindcircles

dots.png

While executing the following code, there are several errors, and I hope to hear advice to fix it.

A = imread('dots.png');
imshow(A)
Rmin = 0;
Rmax = 600;
[centersDark, radiiDark] = imfindcircles(A,[Rmin Rmax],'ObjectPolarity','dark');
viscircles(centersDark, radiiDark ,'Color','w');

errors

Error using imfindcircles>parseInputs (line 240)
The value of 'RadiusRange' is invalid. Expected input number 2, RADIUS_RANGE, to be positive.
Error in imfindcircles (line 142)
parsedInputs  = parseInputs(varargin{:});
Error in trial1_16 (line 8)
[centersDark, radiiDark] = imfindcircles(A,[Rmin Rmax],'ObjectPolarity','dark');

Answer 1

[michio]

As the error message states that "The value of 'RadiusRange' is invalid. Expected input number 2, RADIUS_RANGE, to be positive.", the range have to be a set of positive integers.

Could you try

 Rmin = 1;

instead of 0?