更新R版本后调用fscaret包classVarImp函数出现错误求助

Hey there, let's work through this error you're seeing after updating R and reinstalling packages. The mySystem not found message usually points to an issue with the fscaret package's internal setup or missing dependencies. Here are some actionable steps to fix it:

• Double-check fscaret is properly loaded
  Make sure you've loaded the package with library(fscaret) before calling classVarImp. Sometimes after reinstalling, you might forget to reload it, or there could be silent loading warnings. You can verify the package is active with packageVersion("fscaret") to confirm it's installed and accessible.

• Reinstall fscaret with full dependencies
  When you reinstalled packages, some critical dependencies for fscaret might have been skipped. Try reinstalling the package with all required dependencies using:

  install.packages("fscaret", dependencies = TRUE)
  

  This ensures every package fscaret relies on (like caret, randomForest, or parallel) is installed correctly for your new R version.

• Verify R version compatibility
  Newer R versions can sometimes break compatibility with older packages. Check if fscaret supports your updated R version (you can review the package's CRAN listing for supported R versions). If your R version is too new, you might need to install the development version of fscaret from GitHub (first install devtools if you haven't):

  install.packages("devtools")
  devtools::install_github("pbiecek/fscaret")
  

• Test with a minimal working example
  Rule out issues with your specific code by running a simple, documented example of classVarImp. For instance:

  data(iris)
  x <- iris[, 1:4]
  y <- iris[, 5]
  library(caret)
  fitControl <- trainControl(method = "cv", number = 2)
  definedModels <- c("rf")
  library(fscaret)
  
  # Run the function with sample data
  varImpResults <- classVarImp(definedModels, x, y, x, fitControl, parallel = FALSE)
  

  If this example works, the problem is likely in your custom parameters (like definedModels, xTrain, or fitControl). Double-check that all objects you're passing to classVarImp are correctly defined and not missing.

• Reset your R environment
  Sometimes leftover variables or conflicting packages in your environment can cause unexpected errors. Restart R completely, load only the necessary packages (caret and fscaret), and run your code again without any other loaded objects.

内容的提问来源于stack exchange，提问作者jonas