WL8-B16-IB-12-No-security-definition-has-been-found-for-QGC-C

Mappings map historical symbols to those required by IB, for example. QGC is not an IB contract symbol. If you meant to map IQFeed to a tradable IB symbol, shouldn't you use @QGC#C?

Furthermore, if you want to use IB's own data, don't map at all. Just chart and trade the contract symbol GCZ22.