ERROR: path[1]="": The filename, directory name, or volume label syntax is incorrect

Question

Can anyone explain to me what the following error is and how I can fix it:

ERROR: path[1]="": The filename, directory name, or volume label syntax is incorrect

It's from the RStudio add-in for the package taskscheduleR

Yes, I've checked other similar tickets and still can't figure it out.

Here is a picture of when/how the error gets triggered:

Here is the traceback():

Warning: Error in normalizePath: path[1]="": The filename, directory name, or volume label syntax is incorrect
Stack trace (innermost first):
    3: shiny::runApp
    2: shiny::runGadget
    1: taskscheduleR:::taskschedulerAddin
Error : path[1]="": The filename, directory name, or volume label syntax is incorrect

Edit: Other error

> dir(file.path(.libPaths()[1],"taskscheduleR","extdata"))
[1] "dateformat.rds"        "helloworld.R"          "RscriptRepository.rds"
> taskscheduleR::taskschedulerAddin(file.path(.libPaths()[1],"taskscheduleR","extdata"))
Loading required namespace: shiny
Loading required namespace: miniUI
Loading required package: shiny

Listening on http://127.0.0.1:3334
Warning: Error in normalizePath: path[1]="": The filename, directory name, or volume label syntax is incorrect
Stack trace (innermost first):
    3: shiny::runApp
    2: shiny::runGadget
    1: taskscheduleR::taskschedulerAddin
Error : path[1]="": The filename, directory name, or volume label syntax is incorrect