withdrawalHistory returns error

[bingodonky]

JSONArray response = bitvavo.withdrawalHistory(new JSONObject());

{"errorCode":101,"error":"Unknown error. Operation may or may not have succeeded."}

in class bitvavo.java

int responseCode = httpsCon.getResponseCode();

returns 500

[RaoulSuurmeijer]

Hello,

Ever since a couple of weeks, I'm getting the same error (on requesting balance). But I only get this on new keys(!) Older existing keys still work ok and respond with expected messages.

This also suddenly happens in the example software provided by Bitvavo/Github.