The "Invalid Price" error often occurs when traders use Expert Advisors (EAs) to automate opening and closing orders. This error is recorded in the trading terminal when an EA attempts to execute an order at a price that is no longer available.
Additionally, market volatility can cause this error when rapid price fluctuations occur at the exact moment an order is placed. If the trading terminal and trading server fail to synchronise correctly, this error may also appear.
To resolve this issue, try placing the order again. Most connection-related errors are temporary and will pass with time.