(anonymous function)
D:/call of duty/Time-and-Attendance-Management-System-master/src/services/PostData.js:6
PostData
D:/call of duty/Time-and-Attendance-Management-System-master/src/services/PostData.js:4
Login._this.handleSubmit
D:/call of duty/Time-and-Attendance-Management-System-master/src/components/Login/Login.js:65
HTMLUnknownElement.callCallback
D:/call of duty/Time-and-Attendance-Management-System-master/node_modules/react-dom/cjs/react-dom.development.js:104
invokeGuardedCallbackDev
D:/call of duty/Time-and-Attendance-Management-System-master/node_modules/react-dom/cjs/react-dom.development.js:142
invokeGuardedCallback
D:/call of duty/Time-and-Attendance-Management-System-master/node_modules/react-dom/cjs/react-dom.development.js:191
invokeGuardedCallbackAndCatchFirstError
D:/call of duty/Time-and-Attendance-Management-System-master/node_modules/react-dom/cjs/react-dom.development.js:205
executeDispatch
D:/call of duty/Time-and-Attendance-Management-System-master/node_modules/react-dom/cjs/react-dom.development.js:470
executeDispatchesInOrder
D:/call of duty/Time-and-Attendance-Management-System-master/node_modules/react-dom/cjs/react-dom.development.js:492
executeDispatchesAndRelease
D:/call of duty/Time-and-Attendance-Management-System-master/node_modules/react-dom/cjs/react-dom.development.js:590
executeDispatchesAndReleaseTopLevel
D:/call of duty/Time-and-Attendance-Management-System-master/node_modules/react-dom/cjs/react-dom.development.js:601
forEachAccumulated
D:/call of duty/Time-and-Attendance-Management-System-master/node_modules/react-dom/cjs/react-dom.development.js:571
runEventsInBatch
D:/call of duty/Time-and-Attendance-Management-System-master/node_modules/react-dom/cjs/react-dom.development.js:732
runExtractedEventsInBatch
D:/call of duty/Time-and-Attendance-Management-System-master/node_modules/react-dom/cjs/react-dom.development.js:741
handleTopLevel
D:/call of duty/Time-and-Attendance-Management-System-master/node_modules/react-dom/cjs/react-dom.development.js:4198
batchedUpdates
D:/call of duty/Time-and-Attendance-Management-System-master/node_modules/react-dom/cjs/react-dom.development.js:12406
batchedUpdates
D:/call of duty/Time-and-Attendance-Management-System-master/node_modules/react-dom/cjs/react-dom.development.js:1943
dispatchEvent
D:/call of duty/Time-and-Attendance-Management-System-master/node_modules/react-dom/cjs/react-dom.development.js:4279
interactiveUpdates
D:/call of duty/Time-and-Attendance-Management-System-master/node_modules/react-dom/cjs/react-dom.development.js:12461
interactiveUpdates
D:/call of duty/Time-and-Attendance-Management-System-master/node_modules/react-dom/cjs/react-dom.development.js:1962
dispatchInteractiveEvent
D:/call of duty/Time-and-Attendance-Management-System-master/node_modules/react-dom/cjs/react-dom.development.js:4256
Необходимо исправить вопрос: см.п.3.1 правил. Также не надо размещать скриншот текста, размещайте текст (код оборачивайте тегом code, длинный текст прячьте под спойлер.)
Столкнулся с такой же проблемой. У меня все работает на реакт+постгрю. Мне потребовалось его установить, создать базу данных и вынести в server/.env настройки