'There is no package called 'pillar'.'

Hi,
When I want to upload my excel file, I get the error:
Is this a valid Excel file?
there is no package called 'pillar'.

Therefore I am not able to see my data file.
What can I do?

Sounds like you're using tidyxl read Excel files. Are you? If not, what ARE you using? tidyxl needs pillar. Install it.
install.packages("pillar")

thanks for your reply. But when i type it in i get: error: unexpected symbol in ''install.packages(''pillar''

when i remove '', and type: install.packages(pillar). I get: error in install.packages : object 'pillar' not found.

What next...?

Hey there! Are you typing this exactly? It should not start with a quotation mark and it needs a closing parenthesis.

install.packages("pillar")

thanks for your reply!!
Yes i typed it exactly the same... So not understandig this...

It looks like you missed including the quotes in install.packages("pillar").

did you type two single quotes in stead of one double quote?

for example, this
install.packages(''pillar'')

would result in (you'd see this in the console):

> install.packages(''pillar'')
Error: unexpected symbol in "install.packages(''pillar"