[Python] error: (-215:Assertion failed) trainDescCollection[iIdx].rows < IMGIDX_ONE in...

For the first few iterations it worked perfectly but later on it throw out the same error not sure what exactly is happening..

im1_new=cv2.cvtColor(im1, cv2.COLOR_BGR2RGB)

im2_new=cv2.cvtColor(im2, cv2.COLOR_BGR2RGB)

sift=cv2.xfeatures2d.SIFT_create()

kp1,des1=sift.detectAndCompute(im1_new,None)
kp2,des2=sift.detectAndCompute(im2_new,None)

matcher = cv2.BFMatcher()
matches=matcher.knnMatch(des1,des2,k=2)

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