Issue with Line 137 and 138

Reading Manifest File from: Test_Manifest.txt
Downloading Files to: ./Merged_RNASeq_20190406-132736/
Traceback (most recent call last):
File "gdc-rnaseq-tool.py", line 137, in
data = json.loads(r.text)
File "/home/uavws/anaconda3/lib/python3.6/json/init.py", line 354, in loads
return _default_decoder.decode(s)
File "/home/uavws/anaconda3/lib/python3.6/json/decoder.py", line 339, in decode
obj, end = self.raw_decode(s, idx=_w(s, 0).end())
File "/home/uavws/anaconda3/lib/python3.6/json/decoder.py", line 357, in raw_decode
raise JSONDecodeError("Expecting value", s, err.value) from None
json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0)
uavws@uavws:/media/uavws/SANDISK/gdc-rnaseq-tool$