My shiny app (hosted by shiny.io) failed to start.

Some more ideas:

  • Did you specify/edit your .libPaths at any point? Check by running .libPaths() command in R Studio console.

  • When using functions from the libraries explicitly state their scope. For example:
    readxl::read_excel(path = "yourPath")
    instead of
    read_excel(path = "yourPath").
    This tells it that the function read_excel is in the readxl package.

  • Make sure the excel file is also being deployed to shinyapps.io. You can place it in a 'data' subfolder of your project.

  • It would help if we could see your project code, even if not reprex, if possible.

EDIT: Also found this post with same issue, and potentially root cause is indeed the encoding as I see you use Spanish (has non-standard English characters?). Search for how to save your excel file with UTF-8 encoding. Then can also specify encoding in your read_excel function call:
data <- xlsx::read.xlsx("file.xlsx", sheetIndex = 1, encoding="UTF-8")
If there's any non-standard characters in your R code also, do RStudio: File -> Save with encoding ->UTF-8

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