I believe this bug is caused by tes3cmd, not by Wrye Mash itself. But still reporting:
When using "tes3cmd fixit" command, I get the following error:
Errors
Reset Date of: bloodmoon.esm to: Fri May 2 00:37:30 2003
Reset Date of: morrowind.esm to: Sat Jun 22 05:31:46 2002
Reset Date of: tribunal.esm to: Wed Oct 30 09:22:06 2002
Can't call method "Parameters" on an undefined value at script/tes3cmd line 285.