I am trying to report errors from my rcpp code. I am using the constructor exception (const char *message_, const char *file, int line) from http://dirk.eddelbuettel.com/code/rcpp/html/classRcpp_1_1exception.html. To isolate the problem, I wrote the following bar.cpp:

#include <Rcpp.h>

RcppExport SEXP bar( SEXP x){
        throw(Rcpp::exception("My Error Message","bar.cpp",4));
        return x ;
}

When I run it in R, this is what I get:

> dyn.load("bar.so")
> is.loaded("bar")
[1] TRUE
> .Call("bar",12)
Error: SET_VECTOR_ELT() can only be applied to a 'list', not a 'NULL'
>
c++ r rcpp
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