Error(s) in re-building vignettes:
--- re-building ‘introduction_to_vimp.Rmd’ using rmarkdown
Loading required namespace: glmnet
Chunk unnamed-chunk-6:
  Loading required package: nnls 

library("SuperLearner")
## load specific algorithms
library("gam")
library("xgboost")
Chunk unnamed-chunk-6:
  Super Learner 

library("SuperLearner")
## load specific algorithms
library("gam")
library("xgboost")
Chunk unnamed-chunk-6:
  Version: 2.0-26 

library("SuperLearner")
## load specific algorithms
library("gam")
library("xgboost")
Chunk unnamed-chunk-6:
  Package created on 2019-10-27 

library("SuperLearner")
## load specific algorithms
library("gam")
library("xgboost")
Chunk unnamed-chunk-6:
  Loading required package: splines 

library("SuperLearner")
## load specific algorithms
library("gam")
library("xgboost")
Chunk unnamed-chunk-6:
  Loading required package: foreach 

library("SuperLearner")
## load specific algorithms
library("gam")
library("xgboost")
Chunk unnamed-chunk-6:
  Loaded gam 1.16.1 

library("SuperLearner")
## load specific algorithms
library("gam")
library("xgboost")
Chunk unnamed-chunk-7:
  Warning in model.matrix.default(mt, mf, contrasts): non-list contrasts argument
ignored 

est_1 <- vimp_regression(Y = y, X = x, indx = 1, run_regression = TRUE, 
SL.library = c("SL.gam", "SL.xgboost", "SL.mean"))
Chunk unnamed-chunk-7:
  Warning in model.matrix.default(mt, mf, contrasts): non-list contrasts argument
ignored 

est_1 <- vimp_regression(Y = y, X = x, indx = 1, run_regression = TRUE, 
SL.library = c("SL.gam", "SL.xgboost", "SL.mean"))
Chunk unnamed-chunk-7:
  Warning in model.matrix.default(mt, mf, contrasts): non-list contrasts argument
ignored 

est_1 <- vimp_regression(Y = y, X = x, indx = 1, run_regression = TRUE, 
SL.library = c("SL.gam", "SL.xgboost", "SL.mean"))
Chunk unnamed-chunk-7:
  Warning in model.matrix.default(mt, mf, contrasts): non-list contrasts argument
ignored 

est_1 <- vimp_regression(Y = y, X = x, indx = 1, run_regression = TRUE, 
SL.library = c("SL.gam", "SL.xgboost", "SL.mean"))
Chunk unnamed-chunk-7:
  Warning in model.matrix.default(mt, mf, contrasts): non-list contrasts argument
ignored 

est_1 <- vimp_regression(Y = y, X = x, indx = 1, run_regression = TRUE, 
SL.library = c("SL.gam", "SL.xgboost", "SL.mean"))
Chunk unnamed-chunk-7:
  Warning in model.matrix.default(mt, mf, contrasts): non-list contrasts argument
ignored 

est_1 <- vimp_regression(Y = y, X = x, indx = 1, run_regression = TRUE, 
SL.library = c("SL.gam", "SL.xgboost", "SL.mean"))
Chunk unnamed-chunk-7:
  Warning in model.matrix.default(mt, mf, contrasts): non-list contrasts argument
ignored 

est_1 <- vimp_regression(Y = y, X = x, indx = 1, run_regression = TRUE, 
SL.library = c("SL.gam", "SL.xgboost", "SL.mean"))
Chunk unnamed-chunk-7:
  Warning in model.matrix.default(mt, mf, contrasts): non-list contrasts argument
ignored 

est_1 <- vimp_regression(Y = y, X = x, indx = 1, run_regression = TRUE, 
SL.library = c("SL.gam", "SL.xgboost", "SL.mean"))
Chunk unnamed-chunk-7:
  Warning in model.matrix.default(mt, mf, contrasts): non-list contrasts argument
ignored 

est_1 <- vimp_regression(Y = y, X = x, indx = 1, run_regression = TRUE, 
SL.library = c("SL.gam", "SL.xgboost", "SL.mean"))
Chunk unnamed-chunk-7:
  Warning in model.matrix.default(mt, mf, contrasts): non-list contrasts argument
ignored 

est_1 <- vimp_regression(Y = y, X = x, indx = 1, run_regression = TRUE, 
SL.library = c("SL.gam", "SL.xgboost", "SL.mean"))
Chunk unnamed-chunk-7:
  Warning in model.matrix.default(mt, mf, contrasts): non-list contrasts argument
ignored 

est_1 <- vimp_regression(Y = y, X = x, indx = 1, run_regression = TRUE, 
SL.library = c("SL.gam", "SL.xgboost", "SL.mean"))
Chunk unnamed-chunk-7:
  Warning in model.matrix.default(mt, mf, contrasts): non-list contrasts argument
ignored 

est_1 <- vimp_regression(Y = y, X = x, indx = 1, run_regression = TRUE, 
SL.library = c("SL.gam", "SL.xgboost", "SL.mean"))
Chunk unnamed-chunk-7:
  Warning in model.matrix.default(mt, mf, contrasts): non-list contrasts argument
ignored 

est_1 <- vimp_regression(Y = y, X = x, indx = 1, run_regression = TRUE, 
SL.library = c("SL.gam", "SL.xgboost", "SL.mean"))
Chunk unnamed-chunk-7:
  Warning in model.matrix.default(mt, mf, contrasts): non-list contrasts argument
ignored 

est_1 <- vimp_regression(Y = y, X = x, indx = 1, run_regression = TRUE, 
SL.library = c("SL.gam", "SL.xgboost", "SL.mean"))
Chunk unnamed-chunk-7:
  Warning in model.matrix.default(mt, mf, contrasts): non-list contrasts argument
ignored 

est_1 <- vimp_regression(Y = y, X = x, indx = 1, run_regression = TRUE, 
SL.library = c("SL.gam", "SL.xgboost", "SL.mean"))
Chunk unnamed-chunk-7:
  Warning in model.matrix.default(mt, mf, contrasts): non-list contrasts argument
ignored 

est_1 <- vimp_regression(Y = y, X = x, indx = 1, run_regression = TRUE, 
SL.library = c("SL.gam", "SL.xgboost", "SL.mean"))
Chunk unnamed-chunk-7:
  Warning in model.matrix.default(mt, mf, contrasts): non-list contrasts argument
ignored 

est_1 <- vimp_regression(Y = y, X = x, indx = 1, run_regression = TRUE, 
SL.library = c("SL.gam", "SL.xgboost", "SL.mean"))
Chunk unnamed-chunk-7:
  Warning in model.matrix.default(mt, mf, contrasts): non-list contrasts argument
ignored 

est_1 <- vimp_regression(Y = y, X = x, indx = 1, run_regression = TRUE, 
SL.library = c("SL.gam", "SL.xgboost", "SL.mean"))
Chunk unnamed-chunk-7:
  Warning in model.matrix.default(mt, mf, contrasts): non-list contrasts argument
ignored 

est_1 <- vimp_regression(Y = y, X = x, indx = 1, run_regression = TRUE, 
SL.library = c("SL.gam", "SL.xgboost", "SL.mean"))
Chunk unnamed-chunk-7:
  Warning in model.matrix.default(mt, mf, contrasts): non-list contrasts argument
ignored 

est_1 <- vimp_regression(Y = y, X = x, indx = 1, run_regression = TRUE, 
SL.library = c("SL.gam", "SL.xgboost", "SL.mean"))
Chunk unnamed-chunk-7:
  Warning in model.matrix.default(mt, mf, contrasts): non-list contrasts argument
ignored 

est_1 <- vimp_regression(Y = y, X = x, indx = 1, run_regression = TRUE, 
SL.library = c("SL.gam", "SL.xgboost", "SL.mean"))
Chunk unnamed-chunk-7:
  Warning in model.matrix.default(mt, mf, contrasts): non-list contrasts argument
ignored 

est_1 <- vimp_regression(Y = y, X = x, indx = 1, run_regression = TRUE, 
SL.library = c("SL.gam", "SL.xgboost", "SL.mean"))

Number of messages:
message warning 
      7      22 
dyld: lazy symbol binding failed: Symbol not found: ____chkstk_darwin
  Referenced from: /usr/local/bin/pandoc (which was built for Mac OS X 10.15)
  Expected in: /usr/lib/libSystem.B.dylib

dyld: Symbol not found: ____chkstk_darwin
  Referenced from: /usr/local/bin/pandoc (which was built for Mac OS X 10.15)
  Expected in: /usr/lib/libSystem.B.dylib

Error: processing vignette 'introduction_to_vimp.Rmd' failed with diagnostics:
pandoc document conversion failed with error 6
--- failed re-building ‘introduction_to_vimp.Rmd’

SUMMARY: processing the following file failed:
  ‘introduction_to_vimp.Rmd’

Error: Vignette re-building failed.
Execution halted