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Errors for trading and withdrawals “Invalid Arguments”, “Invalid Price” and “Null”
On the New Order form for Trading and on the Withdrawal form, symbols ($, €, ₿, etc) cannot be used anywhere.
Also if you use decimal values, be aware that:

Examples

Not AcceptableAcceptable
$6300 6300
€5.2005200
.0010.001
For trading specifically, also keep in mind Price and volume decimal precision.
For withdrawals specifically, also keep in mind: