I Encountered sudden error in my expo(react native) project. i've tried the debug mode to get more info about the problem. in my metro bundler console, it shows error as below and get stuck in building js bundle.
::ffff:192.168.0.102 - - [07/Mar/2019:10:59:36 +0000] "GET /node_modules/expo/AppEntry.bundle?platform=android&dev=false&minify=true&hot=false&assetPlugin=D%3A%5CReact%5CBillBord%5Cnode_modules%5Cexpo%5Ctools%5ChashAssetFiles.js HTTP/1.1" 500 - "-" "okhttp/3.6.0"