Error when uploading Excel file

Dear all,

I have troubles uploading any excel files since 10 minutes. I am not sure why or how, it just suddenly gave an error. I upload my files always from "import dataset" and then "From Excel...". This is the message that pops up when I want to upload an Excel file:

"Is this a valid Excel file?

.onLoad failed in loadNamespace() for 'pillar', details:
call: readRDS(nsInfoFilePath)
error: error reading from connection"

I have restarted Rstudio already, and I've tried all Excel files.

Can someone help me with this?
Thanks in advance!!!

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