Hello there, every time I try to open Rstudio, this message always appears, how can I eliminate it or what can I do about it??

go to your project options and disable saving and loading of the workspace.
workspaces are usually more hindrance than help.
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Hi @david4, Im know the write.xlsx() fucntion but is the openxlsx packages.

install.packages(openxlsx)
library(openxlsx)
write.xlsx()