I guess that server cannot find the directory. You include like this:
what is "one directory up then ext/ext-1.0.1"
Is your directory structure as follows?
Just a hint: I was also struggling with this problem especially during development. I had directory test (under document root), I'd made evertything working and then I moved the app to its final place and I had to edit paths of include links.
My solution now ist to start include links with / so I always start from document root. A little bit more typing but I can move files within project tree without fixing anything.