mpvue project, npm run build after the project opens an error

in the process of project development, the project runs normally, the development is completed, the project is finally packaged, run npm run build , then open the project and find an error; no error is reported during the packaging process, and the webpack configuration is not changed

Project error

after rerunning npm run dev , the project will open normally

what may be the cause of this, and can be solved? Thank you