PTR < ccheckerdetector > detector is empty

After downloading the latest opencv + contrib and recompiling it, I found that
Ptr<CCheckerDetector> detector = CCheckerDetector::create();
the information is always unavailable. The detector is empty. I don’t know if anyone has encountered this situation

i assume this is from the mcc module ?

the sample seems to work nice for me, can you check again ?

(also, can you debug it ?)

(and btw, the test images are here)

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Yes,I can debug it.And I will try it again,thanks!