Sharepoint 2007 - Custom webpart deployment doesn't work -

I have a custom webpoint for SharePoint 2007. I'm trying to install it in a new SharePoint web application. I'm using WSPBuilder with VS2010 to deploy When I check the wss \ virtualDirectories \ folder for the web app, the wpcatalog folder does not exist when I go to the Web Part gallery and click on the "New" button, then there is no part of the web. What can be the reason for this behavior? Is it to troubleshoot any other way?

Thank you.

wpcatalog is actually a document library containing .webpart definition files. It is stored in the content database, not the file system.

You need to verify the solution that is actually deployed in your web application, and then activate any feature if necessary. You deploy the solution under Central Administration \ Operation \ Solution Management Can confirm.