Use of Undefined Identifier Error for Rcpp and Eigen

I noticed that the RStudio shows the "use of undefined identifier" error for some of the Rcpp:: and EIgen:: in the code editor. I included Rcpp.h and RcppEigen.h. I am in a project and the project can be compiled without any problem. It shows the error only for some Rcpp:: and Eigen::, and not for the others. The RStusio version is ‘2022.2.0.443’.

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