requiresMainQueueSetup

After upgrade react-native from 0.32 to 049 i have problem using react-native-fs.
on Documentation react-native just Added on Native RNFSManager.m

`+ (BOOL)requiresMainQueueSetup
{
return YES;
} `

but still warning :
Module RNFSManager requires main queue setup since it overrides `constantsToExport` but doesn't implement `requiresMainQueueSetup. In a future release React Native will default to initializing all native modules on a background thread unless explicitly opted-out of.

any solution ??