I had to reinstall AutoCAD Mechanical and now I am getting the above image when I try opening a drawing from a short cut on my desktop.
Here is the target path:
"C:\Program Files\Autodesk\AutoCAD 2016\acad.exe" /p JRMACADMPP /product ACADM /language "en-US" /nologo /t csg_am_ansi_mech /w JRM_Engineering
That .dwt was not used anymore so it was deleted. I created csg_am_ansi_mech from the out of the box am_ansi.dwt