[Rcpp-devel] NULL value passed as symbol address with all C++ functions

[Barth Riley]

I apologize if this question has been asked before but after doing several searches I could not find an answer that is directly applicable to my problem. I am working on a package containing a number of Rcpp functions. The package builds and loads without a problem. However, when I call any of the Rcpp functions from within R, I get the following type of error message:

Error in .Call(<pointer: (nil)>, x, xMin, xMax, adjustment) : 
  NULL value passed as symbol address
	
As an example, here is the function that returned the error in the C++ file:

// [[Rcpp::export]]
NumericVector logit(Rcpp::NumericVector x, 
                    Rcpp::NumericVector xMin,
                    Rcpp::NumericVector xMax, 
                    double adjustment = 0.3) {

  ...

}

The exported function in RcppExports.cpp:

// logit
NumericVector logit(Rcpp::NumericVector x, Rcpp::NumericVector xMin, Rcpp::NumericVector xMax, double adjustment);
RcppExport SEXP _MFRM_logit(SEXP xSEXP, SEXP xMinSEXP, SEXP xMaxSEXP, SEXP adjustmentSEXP) {
BEGIN_RCPP
    Rcpp::RObject rcpp_result_gen;
    Rcpp::RNGScope rcpp_rngScope_gen;
    Rcpp::traits::input_parameter< Rcpp::NumericVector >::type x(xSEXP);
    Rcpp::traits::input_parameter< Rcpp::NumericVector >::type xMin(xMinSEXP);
    Rcpp::traits::input_parameter< Rcpp::NumericVector >::type xMax(xMaxSEXP);
    Rcpp::traits::input_parameter< double >::type adjustment(adjustmentSEXP);
    rcpp_result_gen = Rcpp::wrap(logit(x, xMin, xMax, adjustment));
    return rcpp_result_gen;
END_RCPP
}

And the corresponding R file:

logit <- function(x, xMin, xMax, adjustment = 0.3) {
    .Call(`_MFRM_logit`, x, xMin, xMax, adjustment)
}

First, how can there be two functions called "logit"--one in the main C++ file and one in RcppExports.cpp? And where does _MFRM_logit get defined? Might this be causing the problem?

I should note that hte problem is not limited to this one function, but to all the exported C++ functions. 

Second, is there some option in the project or in the C++ files that needs to be set? 

I am running R 3.51, RStudio 1.14, and Rcpp (0.12.19).
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