Have you installed playwright chromium required browsers?

https://playwright.dev/dotnet/docs/intro

Install required browsers. This example uses net8.0, if you are using a different version of .NET you will need to adjust the command and change net8.0 to your version.

pwsh bin/Debug/net8.0/playwright.ps1 install

this is an example from the Playwright documents, after one build it will generate a .ps1 file so you can execute using terminal, after this installation you good to run the app.