Due to a technical fault on BetFair's historical data server, historical market charts are currently unavailable for all markets since 1 December 2018.
They are doing their best to fix the issue.
We are expecting the charts to be back online around March 2019.
All other charts, real-time BetFair charts (free) and the last traded price and volume (for paid accounts) are available as usual.
Apologies for the inconvenience.