.csv file not found while I am standing in the right place

Please help me to find the error source. I wanna open a .csv file in Rstudio. I am in the right directory but not opened. The error is below:

food <- read.csv("bbb.csv")
Error in file(file, "rt") : cannot open the connection
In addition: Warning message:
In file(file, "rt") : cannot open file 'bbb.csv': No such file or directory

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In the screenshot you wrote

re <- read.csv("bbb")

instead of

re <- read.csv("bbb.csv")

Maybe the problem is just that?

Can you show where the file is? By the RStudio file viewer, or even your computer's normal file browser.

And then in R use getwd() to see what path R is operating in

Of course.

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It is there, but not opened.

Is this a problem with all .csv on your system or just with the .csv of this particular folder?

Try to call the file with the whole path "C:/Users/mehrdad/Documents/bb/bbb.csv"
May be there is a problem with the permission of the bbb.csv?

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I have just this .csv file. I have the file with .xlsx extension. I have the same problem.
I have no idea!

On your computer every / should be written as two // for R

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I wanted to share another photo, but it gave an error. Please check the second photo script.

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thanks

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Yeah... sure.

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That's promising.
And in R again try the function dir() to see the files listen in the working directory.