Warning: Name is nonexistent or not a directory: C:\Users\laura\Desktop\cvx\builtins.
Warning: Name is nonexistent or not a directory: C:\Users\laura\Desktop\cvx\commands.
Warning: Name is nonexistent or not a directory: C:\Users\laura\Desktop\cvx\functions.
Warning: Name is nonexistent or not a directory: C:\Users\laura\Desktop\cvx\lib.
Warning: Name is nonexistent or not a directory: C:\Users\laura\Desktop\cvx\structures.
Warning: Name is nonexistent or not a directory: C:\Users\laura\Desktop\cvx\functions\vec_.
It looks like you installed it once at that location, then moved it. You might want to remove those elements from your path manually; see the MATLAB documentation for instructions on modifying your path. Then reinstall CVX if necessary.