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It means that you are using outdated Kepler release. New developments (and refactoring) required some changes in library set for Kepler. Unfortunately, it's not possible to keep full backward compatibility (one library must be updated).
This may lead to errors while building actors using most recent FC2K release. In order to work without any issues, you have to make sure to use proper version of Kepler
| ITM | IMAS |
|---|---|
fc2k/R3.1.0 requires at least trunk/R5_RC/central | FC2K/4.3.0 requires at least Kepler/2.5p2-2.1.5 |