OrchardCMS/OrchardCore · error · InvalidOperationException

Command arguments " " don't match command definition

Error message

Command arguments "{0}" don't match command definition

What it means

After resolving the command method, InvokeAsync builds the parameter list from the provided arguments; GetInvokeParametersForMethod returns null when the arguments cannot be matched to the method's parameter definition (wrong count or unbindable types). The handler then throws, indicating the CLI invocation does not fit the command's declared signature.

Solutions

1. Compare your invocation against the command method's parameter list and pass the exact required positional arguments.
2. Run the command with no arguments or check help output to see the expected signature.
3. If the signature changed in an upgrade, update scripts/recipes to the new argument order.
4. If you own the command, consider optional parameters or clearer arity handling.

Example fix

// before (expects: setup 'SiteName' 'admin' 'password')
setup 'My Site'
// after
setup 'My Site' 'admin' 'Password1!'

var parameters = methodInfo.GetParameters();
if (arguments.Length != parameters.Length)
    throw new InvalidOperationException($"Command '{methodInfo.Name}' expects {parameters.Length} arguments, got {arguments.Length}");

try { await handler.ExecuteAsync(context); }
catch (InvalidOperationException ex) when (ex.Message.Contains("don't match command definition")) { logger.LogError(ex, "Argument count/order mismatch for command"); }

When it happens

Trigger: Executing a command with more/fewer positional arguments than the handler method's parameters, or arguments that cannot be bound (e.g. missing default/optional parameters) in InvokeAsync called from ExecuteAsync.

Common situations: Command signature changed between versions while scripts still pass old argument orders, users omitting required arguments, or passing extra text after the command name.

Understand the failure class

Background: "must be a positive integer", "cannot be empty", "invalid argument": how invalid-argument errors work across open-source libraries — this error's family across 33 libraries.

Related errors

• Switch " " was not found
• A property " " exists but is not decorated with
• Error converting value
• Method " " does not support switch " ".
• Invalid switch syntax

AI-assisted analysis of OrchardCMS/OrchardCore@4306c0717f (2026-09-13). Data as JSON: /api/errors/7492ab3aee51f1c4. Report an issue: GitHub.

Appendix: source

Thrown at src/OrchardCore/OrchardCore.Infrastructure.Abstractions/Commands/DefaultCommandHandler.cs:71

        catch (Exception ex) when (!ex.IsFatal())
        {
            // TODO: (ngm) fix this message.
            var message = S["Error converting value \"{0}\" to \"{1}\" for switch \"{2}\"",
                commandSwitch.Value,
                propertyInfo.PropertyType.FullName,
                commandSwitch.Key];

            throw new InvalidOperationException(message, ex);
        }
    }

    private async Task InvokeAsync(CommandContext context)
    {
        CheckMethodForSwitches(context.CommandDescriptor.MethodInfo, context.Switches);

        var arguments = (context.Arguments ?? []).ToArray();
        var invokeParameters = GetInvokeParametersForMethod(context.CommandDescriptor.MethodInfo, arguments)
            ?? throw new InvalidOperationException(S["Command arguments \"{0}\" don't match command definition", string.Join(" ", arguments)]);

        Context = context;

        if (context.CommandDescriptor.MethodInfo.ReturnType == typeof(Task<string>))
        {
            var taskResult = await (Task<string>)context.CommandDescriptor.MethodInfo.Invoke(this, invokeParameters);
            await context.Output.WriteAsync(taskResult);
            return;
        }
        else if (typeof(Task).IsAssignableFrom(context.CommandDescriptor.MethodInfo.ReturnType))
        {
            await (Task)context.CommandDescriptor.MethodInfo.Invoke(this, invokeParameters);
            return;
        }

        var result = context.CommandDescriptor.MethodInfo.Invoke(this, invokeParameters);
        if (result is string)
        {

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