error "Could not resolve entry (<module>)" when using manualChunks #164

import resolve from 'rollup-plugin-node-resolve';
import commonjs from 'rollup-plugin-commonjs';
import babel from 'rollup-plugin-babel';

export default [
    {
        experimentalCodeSplitting: true,
        input: [
            './index.jsx', 
            './page1.jsx'
        ],
        output: {
            dir: './dist',
            format: 'system'
        },
        manualChunks: {
            'vendor': ['react']
        },
        plugins: [
            resolve({ extensions: ['.jsx', '.js'] }),
            commonjs(),
            babel({ exclude: 'node_modules/**' })
        ]
    }
];