I have migrated MOSS 2007 sites to SP 2013 using database attach/detach method, when i deploy the custom webparts i see below error on the migrated site:
"Webpart error: A web Part or Web Form Control on the Page cannot be displayed or imported. The type could not be found or it is not registered as safe"
I cant see the webpart in custom(or any other) section when i do add webpart.
Safe controls entry is added for webpart and dll is also in GAC.
Is this because the earlier MOSS sites were created using site templates and we have not migrated the site templates to SP 2013 environment before migration.