Everytime I create a workflow I get an error, here is the error log. I'm using Foundation 2013, so I can't install the Workflow Platform, so that's not the problem, then what is, any ideas? "The steps in this article apply to SharePoint Server 2013. The SharePoint 2013 Workflow platform is not supported in SharePoint Foundation 2013."
11/17/2012 18:18:23.15 w3wp.exe (0x20A8) 0x0804 SharePoint Foundation Monitoring nasq Medium Entering monitored scope (WorkflowTelemetryScope). Parent SPSqlClient c137e29b-880d-c0e2-54cf-d1c3a4dc3bec
11/17/2012 18:18:23.32 w3wp.exe (0x20A8) 0x0804 SharePoint Foundation Legacy Workflow Infrastructure 88xr Unexpected WinWF Internal Error, terminating workflow Id# 0d26adf9-5ae5-4b68-97e9-acffb7f6f71a c137e29b-880d-c0e2-54cf-d1c3a4dc3bec
11/17/2012 18:18:23.32 w3wp.exe (0x20A8) 0x0804 SharePoint Foundation Legacy Workflow Infrastructure 98d4 Unexpected System.InvalidCastException: Unable to cast object of type 'Microsoft.SharePoint.SPFieldUserValueCollection' to type 'System.String'. at Microsoft.SharePoint.Workflow.Application.IssueTracking.GetTaskAssignedToEmailOrUser(Int32
state, Boolean fEmail) at Microsoft.SharePoint.Workflow.Application.IssueTracking.OnBeforeStartedEmail(Object sender, EventArgs e) at System.Workflow.ComponentModel.Activity.RaiseEvent(DependencyProperty dependencyEvent,
Object sender, EventArgs e) at System.Workflow.Activities.CallExternalMethodActivity.Execute(ActivityExecutionContext executionContext) at System.Workflow.ComponentModel.ActivityExecutor`1.Execute(T activity,
ActivityExecutionContext executionContext) at System.Workflow.ComponentModel.ActivityExecutorOperation.Run(IWorkflowCo... c137e29b-880d-c0e2-54cf-d1c3a4dc3bec
11/17/2012 18:18:23.32* w3wp.exe (0x20A8) 0x0804 SharePoint Foundation Legacy Workflow Infrastructure 98d4 Unexpected ...reRuntime workflowCoreRuntime) at System.Workflow.Runtime.Scheduler.Run() c137e29b-880d-c0e2-54cf-d1c3a4dc3bec