Mask RCNN custom data training. Problem with JSON to mat conversion

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I will be really very grateful if somebody can help me here. I am stuck for more than 6 months :(
So, I am trying to train mask RCNN using custom data set. I am following the MATLAB Mask RCNN example here:
I have used image labeler to annotate the images and then used this exportgtruthtoJSON program
However, when I am using this as an input for the Mask RCNN, 'Extract the COCO annotations to MAT files using the unpackAnnotations helper function is not working'. The command window shows the processing is done. but in reatlity the 'annotations_unpacked' folder remains empty.
Please help, if you know how to solve this issue.
Thank you!

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