situation :
In Design Flow, if you transfer a project that has completed Synthesis and Plae and Route and has a green checkmark displayed to another computer and open it there, a yellow exclamation mark will appear.

countermeasure :
The issue may be resolved by creating a shallower folder hierarchy for Libero SoC projects or by shortening the project names.
I would appreciate it if you could try deploying it directly under the C drive.