While executing the code in below link Im getting a python value error in line 55.

https://rrighart.github.io/Gatu/

ValueError: The truth value of a Series is ambiguous. Use a.empty, a.bool(), a.item(), a.any() or a.all().

Code:

xpredictedRUL = list(round(x) for x in predictedRUL)

opredictedRUL = []

for i in range(0,len(xpredictedRUL)):

opredictedRUL = np.concatenate((opredictedRUL, list(reversed(np.arange(xpredictedRUL[i])))))

How to fix this error?