It was figured out that there were two problems happened at the same time and caused this problem.

1. Instead of using 'make install-k1fds', I was using 'make install -k1fds'. By using correct command, the problem was solved.

2. One of the directory was full (/opt/rtcds/kamioka/k1/target/fb/log/old was as large as 18GB) . Then I couldn't make k1fds. By using 'sudo rm -r old', this problem was solved.

Tips:

To check if k1fds is running, command 'lsmod' could be used. After using it, if you see the name k1fds is listed on the left side in a certain column, it means k1fds is running.

To check the space used by different directory, 'du -h --max-depth=2 .' should be used.