Cinema 4D R15 API brings important naming changes:

• If your plugin runs and does not need a recompile, nothing needs to be done.
• If your plugin is recompiled you can either use the old naming scheme in order to keep changes to a minimum or adapt your code to the new one .

Changes for Both New and Old Naming Schemes
Changes for New Naming Scheme
Changes for Old Naming Scheme

List Of Name Changes in R15 API