Package check result: ERROR

Check: examples, Result: ERROR
  Running examples in ‘BayesSIM-Ex.R’ failed
  The error most likely occurred in:
  
  > base::assign(".ptime", proc.time(), pos = "CheckExEnv")
  > ### Name: BayesSIM
  > ### Title: Integrated Function for Bayesian Single-Index Regression
  > ### Aliases: BayesSIM BayesSIM_setup print.bsim
  > 
  > ### ** Examples
  > 
  > ## No test: 
  > set.seed(123)
  > n <- 200; d <- 4
  > theta <- c(2, 1, 1, 1); theta <- theta / sqrt(sum(theta^2))
  > f <- function(u) u^2 * exp(u)
  > sigma <- 0.5
  > X <- matrix(runif(n * d, -1, 1), nrow = n)
  > index_vals <- as.vector(X %*% theta)
  > y <- f(index_vals) + rnorm(n, 0, sigma)
  > simdata <- data.frame(x = X, y = y)
  > colnames(simdata) <- c(paste0("X", 1:4), "y")
  > 
  > # One tool version - bsFisher
  > fit1 <- BayesSIM(y ~ ., data = simdata,
  +                  niter = 5000, nburnin = 1000,
  +                  nchain = 1)
  Build Model
  Assign samplers
  Compile Model
  Error in sizeIndexingBracket(<environment>, new("symbolTable", .xData = <environment>),  : 
    detected unexpected use of `(` in model code in `ARG1_mat_[, (2:x_ncol)]`. Parentheses cannot be used in indexing in NIMBLE models
  Calls: BayesSIM ... exprClasses_setSizes -> eval -> eval -> sizeIndexingBracket
  Execution halted