Importing excel data

I am trying to import a table from excel and when I try to do so, it says: is this a valid excel file there is no package called "assrtthat". If anyone has any idea how to fix this I would appreciate it, thank you.

Hi!

To help us help you, could you please prepare a reproducible example (reprex) illustrating your issue? Please have a look at this guide, to see how to create one:

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