Hi! I had a question regarding Stealth Core.

When I choose for the stamp collector, it always gives me about 10 lines of:
System.FormatException: Input string was not in a correct format. at.System.Number.StringToNumber(String str. NumberStyles options. NumberBuffer& number. NumberFormatInfo info.Boolean parseDecimal) at System.Number.ParseInt32(Strin

After this, however, it can buy stamps correctly again and everything is fine. Is there something I'm doing wrong for it to be like this?

Thanks C: