 Traceback (most recent call last):


 "/home/user/wspace/electrum/lib/util.py", line 792, in run_with_except_hook

run_original(*args2, **kwargs2)


 "/home/user/wspace/electrum/lib/network.py", line 984, in run

self.wait_on_sockets()


 "/home/user/wspace/electrum/lib/network.py", line 966, in wait_on_sockets

self.process_responses(interface)


 "/home/user/wspace/electrum/lib/network.py", line 625, in process_responses

self.process_response(interface, response, callbacks)


 "/home/user/wspace/electrum/lib/network.py", line 574, in process_response

callback(response)


 "/home/user/wspace/electrum/lib/network.py", line 639, in cb2

callback(x2)


 "/home/user/wspace/electrum/lib/synchronizer.py", line 123, in on_address_history

self.wallet.receive_history_callback(addr, hist, tx_fees)


 "/home/user/wspace/electrum/lib/wallet.py", line 915, in receive_history_callback

self.verifier.merkle_roots.pop(tx_hash, None)
 AttributeError: 'NoneType' object has no attribute 'merkle_roots'

Traceback (most recent call last):

 "./eval.py", line 81, in <module>
correct_predictions = float(sum(all_predictions == y_test))TypeError: 'bool' object is not iterable`