when use npm run build,get a error

[xiaochenr1981]

ERROR in ./node_modules/_element-ui@2.15.0@element-ui/src/utils/vue-popper.js
Module build failed: Error: EISDIR: illegal operation on a directory, read
at Object.readSync (fs.js:592:3)
at tryReadSync (fs.js:366:20)
at Object.readFileSync (fs.js:403:19)
at ConfigChainBuilder.addConfig (/home/api_automation_test-master/frontend/node_modules/_babel-core@6.26.3@babel-core/lib/transformation/file/options/build-config-chain.js:146:32)
at ConfigChainBuilder.findConfigs (/home/api_automation_test-master/frontend/node_modules/_babel-core@6.26.3@babel-core/lib/transformation/file/options/build-config-chain.js:102:30)
at buildConfigChain (/home/api_automation_test-master/frontend/node_modules/_babel-core@6.26.3@babel-core/lib/transformation/file/options/build-config-chain.js:61:13)
at OptionManager.init (/home/api_automation_test-master/frontend/node_modules/_babel-core@6.26.3@babel-core/lib/transformation/file/options/option-manager.js:354:58)
at File.initOptions (/home/api_automation_test-master/frontend/node_modules/_babel-core@6.26.3@babel-core/lib/transformation/file/index.js:212:65)
at new File (/home/api_automation_test-master/frontend/node_modules/_babel-core@6.26.3@babel-core/lib/transformation/file/index.js:135:24)
at Pipeline.transform (/home/api_automation_test-master/frontend/node_modules/_babel-core@6.26.3@babel-core/lib/transformation/pipeline.js:46:16)
at transpile (/home/api_automation_test-master/frontend/node_modules/_babel-loader@7.1.5@babel-loader/lib/index.js:50:20)
at Object.module.exports (/home/api_automation_test-master/frontend/node_modules/_babel-loader@7.1.5@babel-loader/lib/index.js:173:20)
@ ./node_modules/_babel-loader@7.1.5@babel-loader/lib!./node_modules/_vue-loader@13.7.3@vue-loader/lib/selector.js?type=script&index=0!./src/views/project/api/FestTest.vue 19:17-59
@ ./src/views/project/api/FestTest.vue
@ ./src/routes.js
@ ./src/main.js

Build complete.

Tip: built files are meant to be served over an HTTP server.
Opening index.html over file:// won't work.

but can use "python3 manage.py runserver 0.0.0.0:8000" to start the server.....but the server create user,cannot login,auth password wrong.