"An unhandled error has occurred" at startup of Blazor WebAssembly application

Question

I am running a Blazor WebAssembly application hosted on ASP.NET and get that error:

localhost/:1 Failed to find a valid digest in the 'integrity' attribute for resource 'https://localhost:5001/_framework/Microsoft.Extensions.DependencyInjection.dll' with computed SHA-256 integrity 'hl/Av7ToL1NqVw6lcR39rksbnDZRwCNcYWtAqBOsOZE='. The resource has been blocked.
localhost/:1 Unknown error occurred while trying to verify integrity.
blazor.webassembly.js:1 Error: Failed to start platform. Reason: TypeError: Failed to fetch
    at blazor.webassembly.js:1
    at blazor.webassembly.js:1
    at Object.throw (blazor.webassembly.js:1)
    at s (blazor.webassembly.js:1)

I have no idea what it is and what it is connected with, so I ask for help...