Error in eval(parse(text = expr[i]), envir = samples) : 
  object '{coefficient_name}' not found

# sample coefs and ACM
set.seed(1234)
coefs <- c(0.1, 0.3, 0.2)
names(coefs) <- c("a", "b", "c")
external <- matrix(
  c(0.021349400, -0.000713893, -0.000529471,
    NA, 3.20933e-03, -2.54593e-05,
    NA, NA, 2.13524e-05
  ),nrow=3)
unnamed <- Matrix::forceSymmetric(external, "L")
# assign names to ACM
named <- unnamed
colnames(named) <- c("a", "b", "c")

semTools::monteCarloCI(expr = c(test = "a*b",
                                test2 = "a*c"),
                       coefs = coefs,
                       ACM = unnamed)

       est ci.lower ci.upper
test  0.03   -0.058    0.119
test2 0.02   -0.039    0.074

Error in eval(parse(text = expr[i]), envir = samples) : 
  object 'a' not found