Generally any SCE module with an Xorg dependency or relationship to X causes loadsce to issue the following error if Xtc is not loaded:
/usr/bin/loadsce: line 215: desktop.sh: not found
Xtc provides desktop.sh. Understandably, it is a feature for newly loaded X applications to update the wbar. However, X and X applications can operate without Xtc and the wbar. Furthermore, some modules (eg. wifi providing wifi.sh) provide functions completely usable without X at all.
When X modules are loaded, they should call desktop.sh if and only if it exists; loadsce should not complain when there is nothing to complain about.
Work-around: non-fatal, ignore the message.