Fisheye:stereocalibration gives error

[raivore]

I have calibrated both cameras separately succesfully, but stereocalibrate gives error - OpenCV(4.6.0) Error: Assertion failed (abs_max < threshold) in cv::fisheye::stereoCalibrate, file C:\Users\Raivo\opencv-4.6.0\modules\calib3d\src\fisheye.cpp, line 1062