The following error codes apply to RPC function calls:
| Error Code | Message | Meaning | Applicable RPC |
| -4220 | SOAP RPC Function not allowed | RPC server function does not exist. | All |
| -4221 | RPC LTCO max date exceeded | Value of (max.) date parameter specified on server for this license has been exceeded. | LTCO |
| -4222 | RPC LTCO invalid date | Not a valid epoch datetime. | LTCO |
| -4225 | RPC Invalid Feature ID | Not a valid 5-character feature ID. | Feature Availability |
| -4500 | RPC Invalid return type | Server returns wrong data type. | All |
| -4501 | RPC number of args mismatch | Server return has wrong number of args. | All |
| -9018 | RPC name/value mismatch | Server return: not all param names have values or vice versa. | All |