Why am I getting an error message: "Variables are being logged to the storage volume, which is now either unavailable or full" on a HMISCU target?

Issue:
"Variables are being logged to the storage volume, which is now either unavailable or full" error message on a HMISCU target


Product Line:
HMISCU, Vijeo Designer, EcoStruxure Machine Expert


Resolution:
It could mean that the HMISCU did not detect the USB stick that is inserted in the target. If that is the case, replace the USB stick with the ones below that has been tested/confirmed:
Sandisk Cruzer Fit 16GB
Kingston DataTraveler 101 4GB
Kingston DataTraveler G3 4GB
Kingston DataTraveler G3 8GB
Kingston DataTraveler G3 32GB
Dane-Elec DaneElec 1GB
Lexar JumpDrive FireFly 1GB
Ocz Rally2 2GB
Schneider Default USB drive 2GB