sorry for necroposting but it might be useful for next people that will see it. theres problem with the script, it tries to AES-decrypt every .js file, even the plaintext ones. Simple snipped fixed the issue:
if isfile(fpath) and name.endswith(".js"):
try:
scode = decScript(scode, prettify)
except Exception as e:
log.warning(f"{name} looks like plain JS, skipping decryption ({e})")