Check the path in the library manager.. see that the last back-slash is a slash?
This means, the back-slashes in the path are wrong.. you need to edit them.
This is a common linux/windows cross running problem.
green = good, red = bad
I also strongly suggest that you reconfigure those paths to use the KISYSMOD path variable and set that one up correctly in KiCAD, as otherwise you will have to do that when you move your libs to some place else.
Only having to modify the path variable is easier instead of every entry in the fp-lib-table file either with an editor or the library manager.
Example:
See here for more info: