Converting labelme annotations (196) into the coco format on Windows, but only 1 file is processed

[yashwant07]

Describe the bug
when I was trying to convert labelme annotations into the coco format I am not able to do it successfully. I have 196 json file I am trying to convert all files but the program for that labelme2coc.py executing only one JSON and the process terminated.

To Reproduce
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Expected behavior
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Desktop (please complete the following information):

• OS: [e.g. Ubuntu 18.04]
• Labelme Version [e.g. 4.2.9]

Additional context
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