ERROR in ./components/lib/card/src/main.vue

Module build failed (from ./node_modules/vue-loader/dist/index.js):

TypeError: Cannot read property 'styles' of undefined

    at Object.loader (F:\vue_demo\evan-ui\node_modules\vue-loader\dist\index.js:70:34)

 @ ./components/lib/card/index.js 1:0-33 3:0-4 4:18-22 4:28-32 7:15-19

ERROR in ./components/lib/demo/src/main.vue

Module build failed (from ./node_modules/vue-loader/dist/index.js):

TypeError: Cannot read property 'styles' of undefined

    at Object.loader (F:\vue_demo\evan-ui\node_modules\vue-loader\dist\index.js:70:34)

 @ ./components/lib/demo/index.js 1:0-33 3:0-4 4:18-22 4:28-32 7:15-19