Hi again, 
No, strapi will not open, and I just get this error message:
$ npm run develop
osebro-antikvariat@0.1.0 develop C:\Users\aneth\OneDrive\FEU 2021\Exam Osebro Antique Book Store\osebro-antikvariat
strapi develop
Building your admin UI with development configuration …
TypeError: The ‘compilation’ argument must be an instance of Compilation
at Function.getCompilationHooks (C:\Users\aneth\OneDrive\FEU 2021\Exam Osebro Antique Book Store\osebro-antikvariat\node_modules\webpack\lib\NormalModule.js:203:10)
at C:\Users\aneth\OneDrive\FEU 2021\Exam Osebro Antique Book Store\osebro-antikvariat\node_modules\mini-css-extract-plugin\dist\index.js:394:103
at SyncHook.eval [as call] (eval at create (C:\Users\aneth\OneDrive\FEU 2021\Exam Osebro Antique Book Store\osebro-antikvariat\node_modules\tapable\lib\HookCodeFactory.js:19:10),
:11:1)
at SyncHook.lazyCompileHook (C:\Users\aneth\OneDrive\FEU 2021\Exam Osebro Antique Book Store\osebro-antikvariat\node_modules\tapable\lib\Hook.js:154:20)
at Compiler.newCompilation (C:\Users\aneth\OneDrive\FEU 2021\Exam Osebro Antique Book Store\osebro-antikvariat\node_modules\strapi-admin\node_modules\webpack\lib\Compiler.js:631:
26)
at C:\Users\aneth\OneDrive\FEU 2021\Exam Osebro Antique Book Store\osebro-antikvariat\node_modules\strapi-admin\node_modules\webpack\lib\Compiler.js:667:29
at AsyncSeriesHook.eval [as callAsync] (eval at create (C:\Users\aneth\OneDrive\FEU 2021\Exam Osebro Antique Book Store\osebro-antikvariat\node_modules\tapable\lib\HookCodeFactor
y.js:33:10), :6:1)
at AsyncSeriesHook.lazyCompileHook (C:\Users\aneth\OneDrive\FEU 2021\Exam Osebro Antique Book Store\osebro-antikvariat\node_modules\tapable\lib\Hook.js:154:20)
at Compiler.compile (C:\Users\aneth\OneDrive\FEU 2021\Exam Osebro Antique Book Store\osebro-antikvariat\node_modules\strapi-admin\node_modules\webpack\lib\Compiler.js:662:28)
at C:\Users\aneth\OneDrive\FEU 2021\Exam Osebro Antique Book Store\osebro-antikvariat\node_modules\strapi-admin\node_modules\webpack\lib\Compiler.js:321:11
at Compiler.readRecords (C:\Users\aneth\OneDrive\FEU 2021\Exam Osebro Antique Book Store\osebro-antikvariat\node_modules\strapi-admin\node_modules\webpack\lib\Compiler.js:529:11)
at C:\Users\aneth\OneDrive\FEU 2021\Exam Osebro Antique Book Store\osebro-antikvariat\node_modules\strapi-admin\node_modules\webpack\lib\Compiler.js:318:10
at AsyncSeriesHook.eval [as callAsync] (eval at create (C:\Users\aneth\OneDrive\FEU 2021\Exam Osebro Antique Book Store\osebro-antikvariat\node_modules\tapable\lib\HookCodeFactor
y.js:33:10), :6:1)
at AsyncSeriesHook.lazyCompileHook (C:\Users\aneth\OneDrive\FEU 2021\Exam Osebro Antique Book Store\osebro-antikvariat\node_modules\tapable\lib\Hook.js:154:20)
at C:\Users\aneth\OneDrive\FEU 2021\Exam Osebro Antique Book Store\osebro-antikvariat\node_modules\strapi-admin\node_modules\webpack\lib\Compiler.js:315:19
at AsyncSeriesHook.eval [as callAsync] (eval at create (C:\Users\aneth\OneDrive\FEU 2021\Exam Osebro Antique Book Store\osebro-antikvariat\node_modules\tapable\lib\HookCodeFactor
y.js:33:10), :15:1)
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! osebro-antikvariat@0.1.0 develop: strapi develop
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the osebro-antikvariat@0.1.0 develop script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.
npm ERR! A complete log of this run can be found in:
npm ERR! C:\Users\aneth\AppData\Roaming\npm-cache_logs\2021-09-02T16_21_18_334Z-debug.log