Simple R Language summary function is giving "Object Not Found" error - r

I'm trying to read a stata file in R Studio using the following code:
library(foreign)
cdata = read.dta("http://www.ats.ucla.edu/stat/data/crime.dta")
summary(cdata)
However, the console is displaying the following error:
summary(cdata)
Error in summary(cdata) : object 'cdata' not found
Can anyone please help me out that why is this happening even though I'm just copying and pasting simple example from this link:
http://www.ats.ucla.edu/stat/r/dae/rreg.htm
Here's my sessioninfo():
sessionInfo()
R version 3.3.1 (2016-06-21)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows >= 8 x64 (build 9200)
locale:
[1] LC_COLLATE=English_United States.1252 LC_CTYPE=English_United States.1252
[3] LC_MONETARY=English_United States.1252 LC_NUMERIC=C
[5] LC_TIME=English_United States.1252
attached base packages:
[1] stats graphics grDevices utils datasets methods base
loaded via a namespace (and not attached):
[1] magrittr_1.5 htmltools_0.3.5 tools_3.3.1 Rcpp_0.12.7 stringi_1.1.1
[6] rmarkdown_1.0 knitr_1.14 stringr_1.1.0 digest_0.6.10 evaluate_0.9

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I'm trying to produce a chunk code that executes and shows the code but hides the output. I know that the way to do it is by adding echo = T, results = 'hide' in knitr chunk options, as suggested here. However, in my case, this still produces the output, any ideas why?
My session info:
> sessionInfo()
R version 3.4.3 (2017-11-30)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows >= 8 x64 (build 9200)
Matrix products: default
locale:
[1] LC_COLLATE=English_United Kingdom.1252
[2] LC_CTYPE=English_United Kingdom.1252
[3] LC_MONETARY=English_United Kingdom.1252
[4] LC_NUMERIC=C
[5] LC_TIME=English_United Kingdom.1252
attached base packages:
[1] stats graphics grDevices utils datasets methods base
loaded via a namespace (and not attached):
[1] compiler_3.4.3 backports_1.1.2 rprojroot_1.3-2 htmltools_0.3.6
[5] tools_3.4.3 yaml_2.2.0 Rcpp_0.12.19 rmarkdown_1.10
[9] knitr_1.20 digest_0.6.18 evaluate_0.12
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I've recently updated my Windows machine and reinstalled R3.4.0 (64bit) and igraph 1.0.1. I've previously used igraph in combination with FCMapper and it's worked perfectly.
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Error in base::.Call("R_igraph_check_finally_stack", PACKAGE =
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I've had a google and the previous responses indicate that it's a NAMESPACE error in the current version of the package. Any help would be appreciated!
sessionInfo()
R version 3.4.0 (2017-04-21) Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows >= 8 x64 (build 9200)
Matrix products: default
locale: [1] LC_COLLATE=English_United Kingdom.1252
LC_CTYPE=English_United Kingdom.1252 LC_MONETARY=English_United
Kingdom.1252 [4] LC_NUMERIC=C
LC_TIME=English_United Kingdom.1252
attached base packages: [1] stats graphics grDevices utils
datasets methods base
other attached packages: [1] igraph_1.0.1 FCMapper_1.1
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failed: cannot open file
'C:/Users/----/AppData/Local/Temp/RtmpQ7pNms/devtools23383d0e4e74/rstudio-keras
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Below is the output from sessionInfo(). Thank you in advance!
R version 3.3.2 (2016-10-31)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 7 x64 (build 7601) Service Pack 1
locale:
[1] LC_COLLATE=English_United States.1252 LC_CTYPE=English_United States.1252 LC_MONETARY=English_United States.1252 LC_NUMERIC=C
[5] LC_TIME=English_United States.1252
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] dplyr_0.5.0 magrittr_1.5 plyr_1.8.4
loaded via a namespace (and not attached):
[1] httr_1.2.1 lazyeval_0.2.0 R6_2.2.0 assertthat_0.1 DBI_0.5-1 tools_3.3.2 withr_1.0.2 curl_2.3 tibble_1.2
[10] memoise_1.1.0 Rcpp_0.12.8 git2r_0.18.0 digest_0.6.10 devtools_1.13.1
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> (korean_hello <- "안녕")
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But in the html file generated by rmarkdown::render, I get following.
(korean_hello <- "안녕")
## [1] "<U+C548><U+B155>"
That is, instead of the native characters, Unicode representation of the string is printed. How do you make it so that the generated html correctly prints what I want?
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> sessionInfo()
R version 3.3.1 (2016-06-21)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows >= 8 x64 (build 9200)
locale:
[1] LC_COLLATE=English_United States.1252
[2] LC_CTYPE=English_United States.1252
[3] LC_MONETARY=English_United States.1252
[4] LC_NUMERIC=C
[5] LC_TIME=English_United States.1252
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> sessionInfo()
R version 3.2.2 (2015-08-14)
Platform: x86_64-w64-mingw32/x64 (64-bit)
Running under: Windows 7 x64 (build 7601) Service Pack 1
locale:
[1] LC_COLLATE=English_United States.1252
[2] LC_CTYPE=English_United States.1252
[3] LC_MONETARY=English_United States.1252
[4] LC_NUMERIC=C
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other attached packages:
[1] httr_1.0.0
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[1] R6_2.1.1 magrittr_1.5 tools_3.2.2 curl_0.9.4
[5] memoise_0.2.1 stringi_1.0-1 stringr_1.0.0 digest_0.6.8
[9] devtools_1.9.1

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