[R] Readxl on Mac

[Dennis Weygand]

>From the following lines of code on an iMac running Catalina 10.15.7


library(readxl)
fname <-  "/Volumes/SD/LabData/Lorentz/Lorentz.xlsx"

Helm <- read_excel(fname,sheet="Helmholtz")

I get the following annoying error:
Error: Evaluation error: zip file

To me this makes no sense: the file in question is not a zip file. The
excel file in question, however, is either open on excel, or recently
opened in excel.
Does anyone know about this error, and what to do about it?
I am running R version 3.5.1

Thanks for any assistance you can provide.

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