For some issues that arise you need to ask the mailing list for help. Remember to include a detailed description of your problem, along with the output of these two functions:
traceback() prints the call stack of the last uncaught error, i.e., the sequence of calls that lead to the error. This is useful when an error occurs with an unidentifiable error message.
sessionInfo() collects information about the current session and prints version information about R and attached or loaded packages.