How to make web parts that can be rendered as static

[GuitarMike]

I've successfully made some web parts in visual studio and deployed them with a cab file and I've used the strongly named assemblies. Now I need to display my web part (the hello world web part at this point) outside of a web part zone. I want to add the web part as a control on the default.aspx page. When I do this, I get an error: 'External component has thrown an exception.'

The code of my web part is as follows:
output.Write(SPEncode.HtmlEncode("Hello World!"));

The webpart works when i drag and drop it onto a page. When I use the following snippet in my default.aspx however, I get the error.

at top:
<%@ Register Tagprefix="INGBC" Assembly="BreadCrumbs, Version=1.0.0.0, Culture=neutral, PublicKeyToken=48c44aa74f9e952b" Namespace="BreadCrumbs" %>

in the page:
<INGBC:BreadCrumbsPart runat="server" id="BreadCrumbsPart" />

I believe I have the namespace/assembly names etc. correct because if I change them, I get other errors like the assembly cannot be found. So, I'm not sure what's wrong at this point. Any help here would be great.

Thanks in advance!

Mike