ERROR: Required field missing (_forward_card_height_)

HearThisAt · 2015-05-05T06:25:09.646Z

I have tested following url in the inside the Card Validator and get the following error:

Independent Drum & Bass Label from Chemnitz, Germany. aim: C Recordings Supported by: Stunna / Pulsaar / Intelligent Manners / MC Conrad / John

ERROR: Required field missing (forward_card_height)

Can you please give an advice whats wrong with the twitter card?

Thank you!