Code=1011 Display Format Mismatch facebook code example
Example: Code=1011 “Display Format Mismatch” facebook
i was using same test id for the Facebook Banner and Interstitial ad unit
Seperating the Adunit ids worked for me like:
IMG_16_9_APP_INSTALL#732965463811239_733275773780208
IMG_16_9_APP_INSTALL#YOUR_PLACEMENT_ID