Upgrade to 0.50.1 - Bundling `index.js` error: bundling failed: Error of metro-bundler

Because of issue #16737 I had to do a workaround (which I’m still not sure works) of saving a backup copy of the pre-upgrade xcodeproj file and pasting it again after upgrading. Now the project loads on XCode, but I can’t run the app. I get this error in the packager:

Loading dependency graph, done.
Bundling `index.js`  [development, non-minified]  0.0% (0/1), failed.
error: bundling failed: Error
    at DependencyGraph.getAbsolutePath (/Users/oriharel/oriApp/anoo/anooClient/node_modules/metro-bundler/src/node-haste/DependencyGraph.js:322:11)
    at DependencyGraph.getDependencies (/Users/oriharel/oriApp/anoo/anooClient/node_modules/metro-bundler/src/node-haste/DependencyGraph.js:300:4465)
    at /Users/oriharel/oriApp/anoo/anooClient/node_modules/metro-bundler/src/Resolver/index.js:135:29
    at Generator.next (<anonymous>)
    at step (/Users/oriharel/oriApp/anoo/anooClient/node_modules/metro-bundler/src/Resolver/index.js:13:830)
    at /Users/oriharel/oriApp/anoo/anooClient/node_modules/metro-bundler/src/Resolver/index.js:13:1060
    at Promise (<anonymous>)
    at /Users/oriharel/oriApp/anoo/anooClient/node_modules/metro-bundler/src/Resolver/index.js:13:741
    at Resolver.getDependencies (/Users/oriharel/oriApp/anoo/anooClient/node_modules/metro-bundler/src/Resolver/index.js:151:46)
    at /Users/oriharel/oriApp/anoo/anooClient/node_modules/metro-bundler/src/Bundler/index.js:660:39

Any help?

Thanks

[rpavlovs]

Same issue. I only have index.js.

[jrumbut]

My project had an edited AppDelegate.m file and I needed to change the line that looked like (though in my case not exactly like)

jsCodeLocation = [[RCTBundleURLProvider sharedSettings] jsBundleURLForBundleRoot:@"index.ios" fallbackResource:nil];

to reflect the change to index.js instead of index.ios.js. Hope that helps someone!