Failed to connect to proxy (Android): Invalid format

I try to preview it on my android phone,but it say

Failed to connect to proxy:
    127.0.0.1:12124:Connection refused
    192.168.40.1:12124:Invalid format: Unable to convert string to int
    192.168.1.189:12124:Invalid format: Unable to convert string to int

I can understand “Connection refused”, But why some are Invalid format?