Can you confirm the presence of SW.DotNetNuke in your [DNNROOT]\bin folder? Ultimately you should have SW.DockMenu, SW.DotNetNuke, SW.Common, SW.License.Common, Codex.Common, JTS.Common, and SW.DotNetNuke.WebControls in your bin folder (not all are directly used by DockMenu, but I package all common DLLs into a single package).
The install folder of the common module does have very little files in there as the files themselves are not used, only the DLLs packaged with it (but to install a module requires at least a "view" control).