Why I can't upload my data to r - r

I’m new in R and try to use it for the GCA/SCA analysis using North Carolina design 2 under agricolae (function: Carolina). I created a small dataset, named as ncd2 and used read to upload. After that I used head(ncd2) to check and everything looked fine.
However, if I use data(ncd2), it gives me the following error message
Warning message:
In data(ncd2) : data set ‘ncd2’ not found
Because of it, I can’t use carolina2 for my analysis. Any help? Thanks. Mack

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I'm using the R package 'googleLanguageR' to transcribe various 30 second audio files (over 500 so want to automatize this). I've followed all the steps in the googleLanguageR tutorials, got my key, and authenticated through R.
I'm able to transcribe the test audio (.wav) that comes with the package, but whenever I apply the same function to my files (.mp3), I get NULL for both transcript and timings.
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test_audio <- system.file("woman1_wb.wav", package = "googleLanguageR")
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I need to plot General transit Feed Specification (GTFS) object routes and their frequencies. For this purpose I have run the following code from the package manual https://cran.r-project.org/web/packages/tidytransit/tidytransit.pdf
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library(tidytransit)
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thanks for posting this!
this happened because we made a change in the API and I think the docs you were looking at were out of sync. they should be up to date now. see http://tidytransit.r-transit.org/articles/introduction.html
also, we made a change so that the plot() function will work as specified in the old docs and in the new docs.

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The code for analysis is:
library(nnet)
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admitqof10_16)
and the error is:
Error in model.frame.default(formula = groupadmit ~ mid_pop, data =
admitqof10_16, :
object 'male16' not found
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May someone please help me know why this problem happens and what I can do to resolve it?
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I'm having trouble locating the packages for corhelp in R. This is what I get.
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# Error: object 'corhelp' not found
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