IndexError: list index out of range in p2ch10

[majorRadiata]

After all the dataloader programming stuff, when I run

series_uid = findPositiveSamples
showCandidate(series_uid)

I receive
Warning: no positive samples found; using first negative sample
IndexError: list index out of range

Visual Code says the problem is in dsets.py

def __getitem__(self, ndx):
--> 138         candidate_info_tup = self.candidate_info_list[ndx]
    139         width_irc = (32, 48, 48)

Don't quite understand what's wrong