Error Codes

When an order is rejected or an action fails, AEX returns an error code with a description. This reference lists common errors and their resolutions.

Order Errors

Error	Description	Resolution
INSUFFICIENT_CREDIT	Your entity does not have enough credit to cover this order	Reduce order size or request a credit limit increase from your counterparty
INVALID_PRICE	Price is outside acceptable bounds	Check the price and ensure it is a valid positive number in tick-size increments
INVALID_QUANTITY	Quantity is zero, negative, or exceeds limits	Enter a valid positive quantity within allowed limits
SESSION_CLOSED	The market is not accepting orders	Wait for the next trading session to open
SESSION_HALTED	Trading has been temporarily halted	Wait for the administrator to resume the market
CONTRACT_EXPIRED	The selected contract has expired	Choose an active contract with a future delivery period
DUPLICATE_ORDER	An identical order was recently submitted	Check your Order List; the previous order may still be active

Connection Errors

Error	Description	Resolution
WS_DISCONNECTED	WebSocket connection lost	Check your network; the client reconnects automatically
AUTH_EXPIRED	Authentication token has expired	Sign in again to refresh your session
AUTH_FAILED	Authentication credentials invalid	Verify your credentials or contact your administrator

Credit Errors

Error	Description	Resolution
LIMIT_EXISTS	A credit limit already exists for this counterparty	Edit the existing limit instead of creating a new one
APPROVAL_REQUIRED	This action requires approval from a counterparty	Wait for the counterparty to approve the request
NOT_AUTHORISED	You do not have permission for this action	Contact your administrator to verify your role assignment

tip

If you encounter an error not listed here, check the Event Log for additional context or contact your administrator.