I have been editing Poser files to create new light sets, poses, etc. Most of the time I simply drop the new files into appropiate folder my Poser install and it works. Although occasionally I get the following message when I try to apply my new file to a pose:

"Warning can not open RuntimeLibraries..."

Anyone have any idea what is going wrong? I am always including a new RSR with the files (made with a little application called RSR Converter) so Poser should be able to find and apply the new pose. Also I am careful that the new file and its RSR have the EXACT same names (but different extensions of course).

Any info would be greatly appreciated.