better missing UseVerify error

src/Verify.Xunit/Verifier.cs

@@ -7,7 +7,7 @@ static InnerVerifier GetVerifier(VerifySettings settings, string sourceFile, boo
         if (!UseVerifyAttribute.TryGet(out var method))
         {
             var fileName = Path.GetFileName(sourceFile);
-            throw new($"Expected to find a `[UseVerify]` on assembly. File: {fileName}.");
+            throw new($"Could not resolve the current test info. This feature uses Verify.Xunit.props to inject `[UseVerify]` on the assembly. File: {fileName}.");
         }
 
         if (useUniqueDirectory)