Invalid base64-encoded string: number of data characters (158533) cannot be 1 more than a multiple of 4

[enamulrafti]

While executing labelme2coco.py I am facing the issue. The issue is:
Traceback (most recent call last):
File "C:\Users\User\anaconda3\lib\site-packages\labelme\label_file.py", line 108, in load
imageData = base64.b64decode(data["imageData"])
File "C:\Users\User\anaconda3\lib\base64.py", line 87, in b64decode
return binascii.a2b_base64(s)
binascii.Error: Invalid base64-encoded string: number of data characters (158533) cannot be 1 more than a multiple of 4

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "F:\iar\prepocessing-codes\labelme2coco.py", line 222, in
main()
File "F:\iar\prepocessing-codes\labelme2coco.py", line 107, in main
label_file = labelme.LabelFile(filename=filename)
File "C:\Users\User\anaconda3\lib\site-packages\labelme\label_file.py", line 44, in init
self.load(filename)
File "C:\Users\User\anaconda3\lib\site-packages\labelme\label_file.py", line 138, in load
raise LabelFileError(e)
labelme.label_file.LabelFileError: Invalid base64-encoded string: number of data characters (158533) cannot be 1 more than a multiple of 4

and i have checked line no 108 in labelme.py which shows:
imageData = base64.b64decode(data["imageData"])

which i have tried to replace with this line:
imageData = base64.b64decode(data["imageData"] + '==')
which show this error:
Traceback (most recent call last):
File "C:\Users\User\anaconda3\lib\site-packages\labelme\label_file.py", line 109, in load
imageData = base64.b64decode(data["imageData"] + '==')
File "C:\Users\User\anaconda3\lib\base64.py", line 87, in b64decode
return binascii.a2b_base64(s)
binascii.Error: Invalid base64-encoded string: number of data characters (678697) cannot be 1 more than a multiple of 4

Help me! thanks in advance.