I deployed a SharePoint solution consisting of 4 webparts. When I try to add one to a page on my SharePoint site, it gives me this error: "a web part or web form control on this page cannot be displayed or imported. the type could not be found or it is not registered as safe."
I've read that I need to add a Safe Control element to web.config and each webpart's Elements.xml file. I took care of that, and double-checked the namespace values on all aforementioned files. But I also read that third-party DLLs need to be signed.
So what is considered a third-party DLL? Anything that does not have Microsoft in its name or a DLL that the project generated? Are there steps I'm missing? If the solution is safe and I still receive that error, then how do I ensure that the "type" (whatever that is) is "found"?
Note: I am using Visual Studio 2010 and SharePoint Server 2010, product version 14