Unexpected error happenend

This is the rescue page. See the exception details below

RailsException

Message:
Error building method arguments. Last param analyzed was manufacturerId with value ''

StackTrace:
   at Castle.MonoRail.Framework.SmartDispatcherController.BuildMethodArguments(ParameterInfo[] parameters, IRequest request, Object[] actionArgs)
   at Castle.MonoRail.Framework.SmartDispatcherController.InvokeMethod(MethodInfo method, IRequest request, Object[] actionArgs)
   at Castle.MonoRail.Framework.Controller.InvokeMethod(MethodInfo method, Object[] methodArgs)
   at Castle.MonoRail.Framework.Controller.InternalSend(String action, Object[] actionArgs)

Inner exception:
BindingException

Message:
Exception converting param 'manufacturerId' to System.Int32. Check inner exception for details

StackTrace:
   at Castle.Components.Binder.DataBinder.BindParameter(Type desiredType, String paramName, CompositeNode treeRoot)
   at Castle.MonoRail.Framework.SmartDispatcherController.BuildMethodArguments(ParameterInfo[] parameters, IRequest request, Object[] actionArgs)

Inner exception:
BindingException

Message:
Conversion error: Could not convert parameter with value 'System.String[]' to expected type System.Int32

StackTrace:
   at Castle.Components.Binder.DefaultConverter.ThrowInformativeException(Type desiredType, Object input, Exception inner)
   at Castle.Components.Binder.DefaultConverter.Convert(Type desiredType, Object input, Boolean& conversionSucceeded)
   at Castle.Components.Binder.DefaultConverter.Convert(Type desiredType, Type inputType, Object input, Boolean& conversionSucceeded)
   at Castle.Components.Binder.DataBinder.ConvertLeafNode(Type desiredType, LeafNode lNode, Boolean& conversionSucceeded)
   at Castle.Components.Binder.DataBinder.ConvertToSimpleValue(Type desiredType, String key, CompositeNode parent, Boolean& conversionSucceeded)
   at Castle.Components.Binder.DataBinder.BindParameter(Type desiredType, String paramName, CompositeNode treeRoot)

Inner exception:
InvalidCastException

Message:
Object must implement IConvertible.

StackTrace:
   at System.Convert.ChangeType(Object value, Type conversionType, IFormatProvider provider)
   at System.Convert.ChangeType(Object value, Type conversionType)
   at Castle.Components.Binder.DefaultConverter.ConvertPrimitive(Type desiredType, Object input, Boolean& conversionSucceeded)
   at Castle.Components.Binder.DefaultConverter.Convert(Type desiredType, Object input, Boolean& conversionSucceeded)

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