[R] Help in R

[Ahmed Elbeltagi]

 Dear,
I have a problem in the last code in R. I have attached code highlighted
with yellow color, files, and screenshot of error.
Waiting for your kind help.
Regards,
Ahmed

-------------- next part --------------
An embedded and charset-unspecified text was scrubbed...
Name: rwc.txt
URL: <https://stat.ethz.ch/pipermail/r-help/attachments/20210706/7207be44/attachment.txt>

-------------- next part --------------
An embedded and charset-unspecified text was scrubbed...
Name: wele.txt
URL: <https://stat.ethz.ch/pipermail/r-help/attachments/20210706/7207be44/attachment-0001.txt>

-------------- next part --------------
An embedded and charset-unspecified text was scrubbed...
Name: tag.txt
URL: <https://stat.ethz.ch/pipermail/r-help/attachments/20210706/7207be44/attachment-0002.txt>

-------------- next part --------------
A non-text attachment was scrubbed...
Name: Screenshot-Error.png
Type: image/png
Size: 106787 bytes
Desc: not available
URL: <https://stat.ethz.ch/pipermail/r-help/attachments/20210706/7207be44/attachment.png>