extern metadata or overload cannot be resolved

Why this fires¶

The provider could not produce type metadata for an external source, or an imported constructor or method has no unambiguous overload for these arguments. The message includes the provider's original compilation or load error.

Fix it¶

Build or install the provider plugin and check the source path. Relative paths resolve from the importing Zolo file. Select explicit types in an import:

use plugin dotnet::{csharp}
extern csharp from "./Counter.cs" use {Counter}

For an ambiguous overload, annotate the arguments or use an explicit typed binding:

extern csharp from "./Tools.dll" fn format(value: i32) -> str = Demo.Tools.Format

Hosted providers need a compatible native host. A WebAssembly backend reports an explicit unsupported-runtime error.