Microsoft.NET.Sdk.StaticWebAssets.targets(684,5): error : System.ArgumentException: Illegal characte

After installing VS 2026 and updating to .NET 10, some web projects build fine, yet others show this error. Also, in solution explorer, I see this:

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Microsoft.NET.Sdk.StaticWebAssets.targets(684,5): error : System.ArgumentException: Illegal characte - C#

C#•3mo ago•

28 replies

After installing VS 2026 and updating to .NET 10, some web projects build fine, yet others show this error. Also, in solution explorer, I see this:

We are a programming server aimed at coders discussing everything related to C# (CSharp) and .NET.

61,871Members

Resources

Was this page helpful?