The Debussy Waveform Viewer v5.0.v15 can't handle double-/ in .vc files.
As an example, create a verilog file named test.v, then create a file test.vc with just one line:
.//test.v
And try to run "debussy -f test.vc"
Debussy doesn't know how to handle the '//' and will have a link error.