Black screen before start the facebook instant game

hello there i am try to create a FB instant game but before the game start there one black screen appear. and when the network goes down while opening the game that screen appear and stay still until I restart the game

This screen is supposed to be the banner you upload for the instant game. The rendering is not handled by cocos in this screen.

i already check it is not flesh screen it is between completing the loading and starting the game I check In many game if you want to check then try the ludo king they have sane issue as mean

This may be related to the project, is there any error reported?

there is no error