I realized that SquidUtils has an annoying side effect of removing the initial slash that usually goes into the chat when you use "/" instead of "t". After some experimentation, it looks like it's using the S:defaultChatText value from SquidUtils.cfg for both even though they really should be separate. Can you please either provide a mechanism to disable that or add an option along the lines of defaultCommandText?
Read thoroughly before posting about crashes with month spans... minecraft mods 101: some mods require a core/base mod. As per what your crash log is telling you, SquidAPI is a required mod for SquidUtils to work.
On another note, why has this mod become discontinued? Not that it's particularly lacking anything as it is, but with all it offers and being unmatched in what it offers... it's a real shame. i Don't quite know how much further it could possibly expand, but leaving it open for possibilities would just be amazing. For example, months and months I've searched for a mod with the capability of modifying armor value (damage reduction) of armor so that balance could be implemented between OP mods and vanilla. This is the only one I have found that does it and does it effectively/simply. THANKYOUSOMUCH.