# Class ArgumentExceptionMessages OptimaJet.Workflow.Core.Fault.ArgumentExceptionMessages Provides common error messages used for argument validation failures. Namespace: [OptimaJet.Workflow.Core.Fault](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Fault/) ```csharp public static class ArgumentExceptionMessages ``` ## Methods `public static string ArgumentMustBePositive(string argumentName, int argumentValue)` Creates a message indicating that an argument value must be a positive integer. ### Parameters | Name | Type | Description | | --- | --- | --- | | `argumentName` | `String` | The name of the argument that failed validation. | | `argumentValue` | `Int32` | The invalid argument value. | ### Returns | Type | Description | | --- | --- | | `String` | A message that describes the required positive value constraint. | [Previous ActorNotFoundException](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Fault/ActorNotFoundException/) [Next CodeActionAlreadyExistsException](https://api.workflowengine.io/core/OptimaJet.Workflow.Core.Fault/CodeActionAlreadyExistsException/)