Hi Temova,
This issue came when you overwrite Smode 8.3 with a Smode 8.4.
May be you did not uninstall Smode 8.3 or the desinstallation fail because it was still running in the backgroud.
To fix that, just delete thoose two files:
C:\Program Files\SmodeTech\Smode Studio\Plugins\Node.dll
C:\Program Files\SmodeTech\Smode Studio\Plugins\Layer.dll
Hopping this can helps.