# RunAsync() fails with arguments passed
**URL:** https://forum.alternetsoft.com/t/runasync-fails-with-arguments-passed/519
**Category:** AlterNET Studio Support
**Tags:** scripter
**Created:** [December 18, 2025, 9:14am UTC](https://forum.alternetsoft.com/t/runasync-fails-with-arguments-passed/519 "2025-12-18T09:14:41Z")
**Posts on this page:** 10
**Page:** 1
### Author:  [@tsp\_extern\_pa](https://forum.alternetsoft.com/u/tsp_extern_pa)
#### Post date: [December 18, 2025, 9:14am UTC](https://forum.alternetsoft.com/t/runasync-fails-with-arguments-passed/519/1 "2025-12-18T09:14:41Z")
The following script failed to execute, because ScriptRun.RunAsync() throws an exception, even though the program code is valid → System.Reflection.TargetParameterCountException: ‘Parameter count mismatch.’.
The project is very simple, a console app with basic scripting - but using async Tasks.
Project:
```auto
Exe
net9.0
Bug_in_Alternet
disable
disable
x64
```
Program.cs:
```auto
using Alternet.Scripter;
using System;
using System.Threading.Tasks;
class Program
{
const string AsyncScript = """
using System;
using System.Threading.Tasks;
class AsyncScriptProgram
{
static async Task Main(string[] args)
{
Console.WriteLine($"\t{args.Length} Args:");
for (int i = 0; i < args.Length; i++)
Console.WriteLine($"\tArg[{i}]: {args[i]}");
Console.WriteLine($"\tWait a bit");
await Task.Delay(100);
}
}
""";
public static async Task Main(string[] args)
{
Console.WriteLine("Create Script Runtime");
ScriptRun scriptRun = new ScriptRun()
{
AssemblyKind = ScriptAssemblyKind.ConsoleApplication,
ScriptMode = ScriptMode.Debug,
ScriptLanguage = ScriptLanguage.CSharp,
Platform = ScriptPlatform.X64,
};
scriptRun.ScriptSource.FromScriptCode(AsyncScript);
scriptRun.ScriptSource.WithSystemReferences(ScriptTechnologyEnvironment.System, WithSystemReferencesFlags.None);
Console.WriteLine("Compile Script");
if (!scriptRun.Compile())
{
Console.Error.WriteLine("Failed to compile Script!");
foreach (ScriptCompilationDiagnostic compileError in scriptRun.ScriptHost.CompilerErrors)
Console.Error.WriteLine(compileError.ToString());
}
else
Console.WriteLine("Successfully compiled Script");
string[] scriptArgs = ["Hallo", "Welt", "der", "Programmierer"];
Console.WriteLine("Run Script");
await scriptRun.RunAsync(scriptArgs);
Console.WriteLine("Completed Script");
Console.WriteLine("Done, press key to exit");
Console.ReadKey();
}
}
```
---
### Author:  [@generalloki](https://forum.alternetsoft.com/u/generalloki)
#### Post date: [December 18, 2025, 4:57pm UTC](https://forum.alternetsoft.com/t/runasync-fails-with-arguments-passed/519/2 "2025-12-18T16:57:04Z")
Thank you for the bug report. I was able to reproduce the issue with your sample project. We are currently investigating the cause and working on a fix. I will post an update here—hopefully by tomorrow—once we have a solution or further information.
---
### Author:  [@generalloki](https://forum.alternetsoft.com/u/generalloki)
#### Post date: [December 19, 2025, 4:45am UTC](https://forum.alternetsoft.com/t/runasync-fails-with-arguments-passed/519/3 "2025-12-19T04:45:55Z")
There were a bug in `ScriptMethod.InvokeMainMethod`. With the fix it works fine on your sample project. We will test it in other scenarios and hope to include with the next build which is planned very soon.
---
### Author:  [@tsp\_extern\_pa](https://forum.alternetsoft.com/u/tsp_extern_pa)
#### Post date: [December 19, 2025, 6:35am UTC](https://forum.alternetsoft.com/t/runasync-fails-with-arguments-passed/519/4 "2025-12-19T06:35:12Z")
Awesome! Thanks for the fast response.
---
### Author:  [@generalloki](https://forum.alternetsoft.com/u/generalloki)
#### Post date: [January 8, 2026, 8:00am UTC](https://forum.alternetsoft.com/t/runasync-fails-with-arguments-passed/519/5 "2026-01-08T08:00:39Z")
This was fixed in 10.0.6 build which was just released.
---
### Author:  [@tsp\_extern\_pa](https://forum.alternetsoft.com/u/tsp_extern_pa)
#### Post date: [January 12, 2026, 9:01am UTC](https://forum.alternetsoft.com/t/runasync-fails-with-arguments-passed/519/6 "2026-01-12T09:01:36Z")
The actual bug with async Main(string args) is now fixed in 10.0.6, but there is another bug which is directly related - ~~which maybe got broken in that fix~~.
The following script does not run, because the arguments string array are always 1 and contains a single element, that is an string array with the actual arguments.
```auto
class ScriptProgram
{
public static int Main(string[] args)
{
Console.WriteLine($"\t{args.Length} Args:");
for (int i = 0; i < args.Length; i++)
Console.WriteLine($"\tArg[{i}]: {args[i]}");
if (args.Length == 0) {
Console.Error.WriteLine($"\tNo file arguments passed");
return -1;
}
for (int i = 0; i < args.Length; i++) {
string filePath = args[i];
Console.WriteLine($"\tOpen file: {filePath}");
// ...
}
return 0;
}
}
```
That script is run like this (no async!):
```auto
string[] scriptArgs = ["FileA", "FileB", "FileC"]; // Is just an example
Console.WriteLine($"Run Script with args '{string.Join("|", scriptArgs)}'");
try
{
object returnValue = scriptRun.Run(scriptArgs);
Console.WriteLine($"Completed Script with return value: {returnValue}");
}
catch (Exception e)
{
Console.Error.WriteLine($"Failed to Run Script:\n{e.ToString()}");
}
```
The console output of the script shows clearly what is going wrong:
```auto
1 Args:
Arg[0]: System.String[]
Open file: System.String[]
```
---
### Author:  [@tsp\_extern\_pa](https://forum.alternetsoft.com/u/tsp_extern_pa)
#### Post date: [January 21, 2026, 8:08am UTC](https://forum.alternetsoft.com/t/runasync-fails-with-arguments-passed/519/7 "2026-01-21T08:08:09Z")
What is the state of the Run() with arguments single object string array bug? Will this be fixed?
---
### Author:  [@generalloki](https://forum.alternetsoft.com/u/generalloki)
#### Post date: [January 21, 2026, 2:58pm UTC](https://forum.alternetsoft.com/t/runasync-fails-with-arguments-passed/519/8 "2026-01-21T14:58:56Z")
I will study the issue and respond to you shortly.
---
### Author:  [@generalloki](https://forum.alternetsoft.com/u/generalloki)
#### Post date: [January 22, 2026, 1:49pm UTC](https://forum.alternetsoft.com/t/runasync-fails-with-arguments-passed/519/9 "2026-01-22T13:49:54Z")
Thank you for the report. For some reason, we did not receive a notification about the topic update from the forum engine.
I was able to reproduce the issue with `Run(string[])` in version 10.0.6, and it was fixed in the master branch today.
We will include the fix in the next build.
---
### Author:  [@generalloki](https://forum.alternetsoft.com/u/generalloki)
#### Post date: [February 6, 2026, 4:53am UTC](https://forum.alternetsoft.com/t/runasync-fails-with-arguments-passed/519/10 "2026-02-06T04:53:14Z")
We have just released Alternet.Studio build 10.0.7, which includes a fix for the issue. You will shortly receive a notification about the library update. Please let us know whether everything is working correctly now.