Registration problems:
  symbol ‘`_mrgsolve_DEVTRAN`’ not in namespace:
   .Call(`_mrgsolve_DEVTRAN`, parin, inpar, parnames, init, cmtnames, 
       capture, funs, data, idata, OMEGA, SIGMA, envir)
  symbol ‘`_mrgsolve_EXPAND_EVENTS`’ not in namespace:
   .Call(`_mrgsolve_EXPAND_EVENTS`, idcol_, events, id)
  symbol ‘`_mrgsolve_MVGAUSS`’ not in namespace:
   .Call(`_mrgsolve_MVGAUSS`, OMEGA_, n)
  symbol ‘`_mrgsolve_QUICKSIM`’ not in namespace:
   .Call(`_mrgsolve_QUICKSIM`, parin, param, init, parnames, data, 
       n, idata, req, capturei, funs, nre)
  symbol ‘`_mrgsolve_SUPERMATRIX`’ not in namespace:
   .Call(`_mrgsolve_SUPERMATRIX`, x, keep_names)
  symbol ‘`_mrgsolve_TOUCH_FUNS`’ not in namespace:
   .Call(`_mrgsolve_TOUCH_FUNS`, lparam, linit, Neta, Neps, capture, 
       funs, envir)
  symbol ‘`_mrgsolve_dcorr`’ not in namespace:
   .Call(`_mrgsolve_dcorr`, x)
  symbol ‘`_mrgsolve_dcorr`’ not in namespace:
   .Call(`_mrgsolve_dcorr`, x)
  symbol ‘`_mrgsolve_get_tokens`’ not in namespace:
   .Call(`_mrgsolve_get_tokens`, x)
  symbol ‘`_mrgsolve_get_tokens`’ not in namespace:
   .Call(`_mrgsolve_get_tokens`, x)
  symbol ‘`_mrgsolve_EXPAND_EVENTS`’ not in namespace:
   .Call(`_mrgsolve_EXPAND_EVENTS`, match("ID", colnames(ev), 0), 
       numeric_data_matrix(ev), idata[, "ID"])
  symbol ‘`_mrgsolve_MVGAUSS`’ not in namespace:
   .Call(`_mrgsolve_MVGAUSS`, mat, n)
  symbol ‘`_mrgsolve_QUICKSIM`’ not in namespace:
   .Call(`_mrgsolve_QUICKSIM`, PACKAGE = "mrgsolve", parin(x), as.numeric(param(x)), 
       as.numeric(init(x)), pars(x), e, attr(e, "n"), data.matrix(idata), 
       as.integer(req - 1), cap, pointers(x), as.integer(c(sum(nrow(omat(x))), 
           sum(nrow(smat(x))))))
  symbol ‘`_mrgsolve_TOUCH_FUNS`’ not in namespace:
   .Call(`_mrgsolve_TOUCH_FUNS`, param, init, neta, neps, x@capture, 
       funp, x@envir)
  symbol ‘`_mrgsolve_DEVTRAN`’ not in namespace:
   .Call(`_mrgsolve_DEVTRAN`, parin, param, names(param(x)), init, 
       names(Init(x)), capt_pos, pointers(x), data, idata, as.matrix(omat(x)), 
       as.matrix(smat(x)), x@envir)
See chapter ‘System and foreign language interfaces’ in the ‘Writing R
Extensions’ manual.