Revit "My First Plugin" lesson 1 error message

[kohogg1782]

I've just done lesson 1 of the "my First Plugin" tutroials and i get the attached error message.

As far as i can tell i haven't made any errors in the code and manifest file, but any advice would be really great!

code:

using System;
using System.Collections.Generic;
using System.Linq;

using Autodesk.Revit.DB;
using Autodesk.Revit.UI;
using Autodesk.Revit.UI.Selection;
using Autodesk.Revit.ApplicationServices;
using Autodesk.Revit.Attributes;

namespace Lab1PlaceGroup
{
[TransactionAttribute(TransactionMode.Manual)]
[RegenerationAttribute(RegenerationOption.Manual)]
public class Lab1PlaceGroup : Autodesk.Revit.UI.IExternalCommand
{
public Autodesk.Revit.UI.Result Execute(ExternalCommandData commandData, ref string message, ElementSet elements)

{
// Get application and document objects
UIApplication uiApp = commandData.Application;
Document doc = uiApp.ActiveUIDocument.Document;

// Define a reference object to accept the pick result
Reference pickedRef = null;

// Pick a group
Selection sel = uiApp.ActiveUIDocument.Selection;
pickedRef = sel.PickObject(ObjectType.Element, "Please select a group");
Element elem = doc.GetElement(pickedRef);
Group group = elem as Group;

// Pick a point
XYZ point = sel.PickPoint("Please pick a point to place a group");

// Place the group
Transaction trans = new Transaction(doc);
trans.Start("Lab");
doc.Create.PlaceGroup(point, group.GroupType);
trans.Commit();

return Autodesk.Revit.UI.Result.Succeeded;

}
}
}

manifest file:

<?xml version="1.0" encoding="utf-8" standalone="no"?>
<RevitAddIns>
<AddIn Type="Command">
<Assembly>
L:\k.hogg\VB\Lab1PlaceGroup\Lab1PlaceGroup\bin\Debug\Lab1PlaceGroup.dll
</Assembly>
<ClientId>502fe383-2648-4e98-adf8-5e6047f9dc34</ClientId>
<FullClassName>Lab1PlaceGroup</FullClassName>
<Text>Lab1PlaceGroup</Text>
<VendorId>ADSK</VendorId>
<VisibilityMode>AlwaysVisible</VisibilityMode>
</AddIn>
</RevitAddIns>

[BobbyC.Jones]

I've never done the plugin lessons, so this is a guess, but the FullClassName node in the manifest requires a fully qualified class name, i.e. it needs the namespace and class name. Try <FullClassName>Lab1PlaceGroup.Lab1PlaceGroup</FullClassName>

[kohogg1782]

thanks, this doesn't seem to make any difference. I still get the same error message??

[stever66]

Are you sure your path to the .dll file name is correct? 

L:\k.hogg\VB\Lab1PlaceGroup\Lab1PlaceGroup\bin\Deb​ug\Lab1PlaceGroup.dll

One thing that makes this a little easier is to place the dll file in the same directory with the addin file and use a relative path like this;

<Assembly>.\Lab1PlaceGroup.dll</Assembly>

Also, check the time stamp on the .dll file, and make sure you are using your most recent build.  If you change to a release build, it will put it in a different folder.  Also, sometimes it doesn't update until you do a "rebuild".

[JimJia]

Hi,
I believe your manifest file is not correct, because it's saying "Lab1PlaceGroup is not found"; as Bobby pointed out,you should specify full class name like this: <FullClassName>Lab1PlaceGroup.Lab1PlaceGroup</FullClassName>.

If you still get same issue, you can try to use addin manager tool to load your assembly, or use the addin manager tool to retrieve the manifest.