Why would you think that that error has anything to do with ratelimiting or anything like that? The error spells out clearly what the problem is. "com.google.bitcoin.core.AddressFormatException", meaning that it's a problem with the format of an address, and then it tells you explicitly that the address is invalid because it contains an illegal character, namely the capital letter O. If you haven't already, I strongly suggest you read https://en.bitcoin.it/wiki/Base58Check_encoding and https://en.bitcoin.it/wiki/Technical_background_of_version_1_Bitcoin_addresses .
Oh wow, you are absolutely right. Thank you very much!
You're welcome
This exchange kinda made my forumday. Well done.