Thunk an asynchronous action call to another asynchronous action error indicates a lack of middleware

it turns out that there is no problem with this use. Since updating create-react-app, re-eject and updating some dependent libraries, there have been problems

< H2 > 1. Store < / H2 >
"react": "^16.5.2",
"react-redux": "^5.0.7",
"react-redux-loading-bar": "^4.0.8",
"react-router-dom": "^4.3.1",
"react-router-redux": "^5.0.0-alpha.9",
"redux": "^4.0.1",
"redux-thunk": "^2.3.0",
Sep.05,2021

fetchExportSchoolByStage should not return a promise object, but a function (the arrow is missing once

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