hot update failed for module "./src/views/App.tsx"

[crazychaz]

react-hot-loader.development.js:297 hot update failed for module "./src/views/App.tsx". Last file processed: "./src/views/ScrollToTop.tsx".
error @ react-hot-loader.development.js:297
eval @ react-hot-loader.development.js:3062
setTimeout (async)
chargeFailbackTimer @ react-hot-loader.development.js:3060
hot @ react-hot-loader.development.js:3179
eval @ root.js:25
./node_modules/react-hot-loader/root.js @ vendors.cfb2aaaf.entry.js:33830
webpack_require @ spa.365bc1d8.entry.js:1648
fn @ spa.365bc1d8.entry.js:2050
eval @ App.tsx:7
webpack_require.a @ spa.365bc1d8.entry.js:1733
eval @ App.tsx:1
./src/views/App.tsx @ spa.365bc1d8.entry.js:1399
webpack_require @ spa.365bc1d8.entry.js:1648
fn @ spa.365bc1d8.entry.js:2050
eval @ index.tsx:5
webpack_require.a @ spa.365bc1d8.entry.js:1733
eval @ index.tsx:1
./src/views/index.tsx @ spa.365bc1d8.entry.js:1432
webpack_require @ spa.365bc1d8.entry.js:1648
(anonymous) @ spa.365bc1d8.entry.js:3013
webpack_require.O @ spa.365bc1d8.entry.js:1776
(anonymous) @ spa.365bc1d8.entry.js:3014
(anonymous) @ spa.365bc1d8.entry.js:3016
react-hot-loader.development.js:1607 {toString: ƒ}
logException @ react-hot-loader.development.js:1607
eval @ react-hot-loader.development.js:3063
setTimeout (async)
chargeFailbackTimer @ react-hot-loader.development.js:3060
hot @ react-hot-loader.development.js:3179
eval @ root.js:25
./node_modules/react-hot-loader/root.js @ vendors.cfb2aaaf.entry.js:33830
webpack_require @ spa.365bc1d8.entry.js:1648
fn @ spa.365bc1d8.entry.js:2050
eval @ App.tsx:7
webpack_require.a @ spa.365bc1d8.entry.js:1733
eval @ App.tsx:1
./src/views/App.tsx @ spa.365bc1d8.entry.js:1399
webpack_require @ spa.365bc1d8.entry.js:1648
fn @ spa.365bc1d8.entry.js:2050
eval @ index.tsx:5
webpack_require.a @ spa.365bc1d8.entry.js:1733
eval @ index.tsx:1
./src/views/index.tsx @ spa.365bc1d8.entry.js:1432
webpack_require @ spa.365bc1d8.entry.js:1648
(anonymous) @ spa.365bc1d8.entry.js:3013
webpack_require.O @ spa.365bc1d8.entry.js:1776
(anonymous) @ spa.365bc1d8.entry.js:3014
(anonymous) @ spa.365bc1d8.entry.js:3016
controlPanel.tsx:13 Uncaught (in promise) TypeError: Cannot read properties of undefined (reading 'sections')
at eval (controlPanel.tsx:13:5)
at ./src/controlPanel.tsx (main.js:73:1)
at webpack_require (main.js:184:41)
at eval (chart.ts:7:71)
at ./src/chart.ts (main.js:51:1)
at webpack_require (main.js:184:41)
at eval (entry.ts:2:64)
at ./src/entry.ts (main.js:84:1)
at webpack_require (main.js:184:41)
at main.js:236:37

browser error on startup dev-server