terminate called after throwing an instance of 'cv::Exception'

[hvui]

Hi i was trying to use openfabmap for my school project and while i trying to "GenerateFABMAPTrainData" it goes

terminate called after throwing an instance of 'cv::Exception'
what(): OpenCV(4.2.0) ../modules/flann/src/miniflann.cpp:315: error: (-210:Unsupported format or combination of formats) in function 'buildIndex_'

type=0

Aborted (core dumped)

any idea what might be causing it? I am using orb feature for detection and extraction.