The 3D Viewer isn't currently compatible with Mendix 10
The error you see related to httpclient.URI is caused by missing jar files
You can either try to get those files from somewhere else, or download the 3D Viewer test app, export the 3DViewer module and use it in your app
Note too that the Teamcenter connector for Mendix 10 functions a bit differently than previous versions. You will only get data for objects explicitly included in your business object mappings and query inputs match the L10 entries rather than the display names. I also don't think that the ExpandGRMRelationsForPrimary and Secondary actions work properly any more. The test app has replaced these with use of call Teamcenter Service