searchTemplate ERROR

[kotobukidevelopers]

I have stumble the error communication error
mentioned in #89 the problem is that the thread doesn't explain the whole problem and the exact solution

ok here is the instance

I have registered my fingerprint in R307 module then save the FINGERPRINT_BUFFER1 characteristic in the database
then I will sync the other R307 with the given fingerprint buffer using the uploadCharacteristics()

here is the snippet
Second R307
f.uploadCharacteristics(FINGERPRINT_CHARBUFFER1,json.loads(row[2]))
//check if the fp data is in the module
result = f.searchTemplate()
pos_no = result[0]
if pos_no == -1:
print("register to module")
else:
print("already in the module")

so means on second r307 I wanna check if the fingerprint is already registered in the module however when I perform a searchTemplate()
this throws an exception of communication error

the GOAL is to check the fingerprint if it exist before adding it in the second module