Error in GCP credentials.json authorization and .httr-oauth for CRAN package?

[Emon-ProCoder7]

I am in trouble finding proper credential authorization for my ''RoogleVision" from Google. Here I'm providing the whole detail.
On my GCP account, I've:

 - just added no scope, just the support email - in OAuth consent screen
 - On my Credentials - Just created the - OAuth 2.0 Client IDs. With javascript origin URI and Redirect URI with my rstudio local domain and shiny.io.

I saved the credentials.json on my current working directory. On my R console I used this code:

library(googleAuthR) gar_set_client(web_json = "credentials.json")

The browser opens the app just fine, but for connecting google API it shows this error in console:

No authorization yet in this session!
No .httr-OAuth file exists in current working directory. Do library authentication steps to provide credentials.
Warning: Error in : Invalid token
78: stop
77: simpleCall
76: getGoogleVisionResponse
72: observeEventHandler [/cloud/project/server.R#28]

Here is my session info:

Failed to create bus connection: No such file or directory
─ Session info ─────────────────────────────────────────────────────────────────────────────
setting value
version R version 3.6.3 (2020-02-29)
os Ubuntu 16.04.6 LTS
system x86_64, linux-gnu
ui RStudio
language (EN)
collate C.UTF-8
ctype C.UTF-8
tz Etc/UTC
date 2020-07-10

─ Packages ─────────────────────────────────────────────────────────────────────────────────
package * version date lib source
abind 1.4-5 2016-07-21 [1] RSPM (R 3.6.0)
assertthat 0.2.1 2019-03-21 [1] RSPM (R 3.6.0)
backports 1.1.8 2020-06-17 [1] RSPM (R 3.6.0)
base64enc 0.1-3 2015-07-28 [1] RSPM (R 3.6.0)
bitops 1.0-6 2013-08-17 [1] RSPM (R 3.6.0)
broom 0.5.3 2019-12-14 [1] RSPM (R 3.6.0)
callr 3.4.3 2020-03-28 [1] RSPM (R 3.6.0)
cellranger 1.1.0 2016-07-27 [1] RSPM (R 3.6.0)
cli 2.0.2 2020-02-28 [1] RSPM (R 3.6.0)
colorspace 1.4-2 2019-12-29 [1] R-Forge (R 3.6.0)
crayon 1.3.4 2017-09-16 [1] RSPM (R 3.6.0)
crosstalk 1.1.0.1 2020-03-13 [1] RSPM (R 3.6.0)
DBI 1.1.0 2019-12-15 [1] RSPM (R 3.6.0)
dbplyr 1.4.2 2019-06-17 [1] RSPM (R 3.6.0)
desc 1.2.0 2018-05-01 [1] RSPM (R 3.6.0)
devtools * 2.3.0 2020-04-10 [1] RSPM (R 3.6.0)
digest 0.6.25 2020-02-23 [1] RSPM (R 3.6.0)
dplyr * 0.8.3 2019-07-04 [1] RSPM (R 3.6.0)
DT * 0.13 2020-03-23 [1] RSPM (R 3.6.0)
EBImage * 4.28.1 2019-12-06 [1] Bioconductor
ellipsis 0.3.1 2020-05-15 [1] RSPM (R 3.6.0)
evaluate 0.14 2019-05-28 [1] RSPM (R 3.6.0)
fansi 0.4.1 2020-01-08 [1] RSPM (R 3.6.0)
fastmap 1.0.1 2019-10-08 [1] RSPM (R 3.6.0)
fftwtools 0.9-8 2017-03-25 [1] RSPM (R 3.6.0)
flexdashboard * 0.5.1.1 2018-06-29 [1] RSPM (R 3.6.0)
glue 1.4.1 2020-05-13 [1] RSPM (R 3.6.0)
googleAuthR * 1.3.0 2020-06-16 [1] RSPM (R 3.6.3)
gtable 0.3.0 2019-03-25 [1] RSPM (R 3.6.0)
haven 2.2.0 2019-11-08 [1] RSPM (R 3.6.0)
hms 0.5.3 2020-01-08 [1] RSPM (R 3.6.0)
htmltools 0.5.0 2020-06-16 [1] RSPM (R 3.6.0)
htmlwidgets 1.5.1 2019-10-08 [1] RSPM (R 3.6.0)
httpuv 1.5.2 2019-09-11 [1] RSPM (R 3.6.0)
httr 1.4.1 2019-08-05 [1] RSPM (R 3.6.0)
janitor * 2.0.1 2020-04-12 [1] RSPM (R 3.6.0)
jpeg 0.1-8.1 2019-10-24 [1] RSPM (R 3.6.0)
jsonlite * 1.7.0 2020-06-25 [1] CRAN (R 3.6.3)
leaflet * 2.0.3 2019-11-16 [1] RSPM (R 3.6.3)
lifecycle 0.2.0 2020-03-06 [1] RSPM (R 3.6.0)
locfit 1.5-9.1 2013-04-20 [1] RSPM (R 3.6.0)
lubridate 1.7.4 2018-04-11 [1] RSPM (R 3.6.0)
magick * 2.4.0 2020-06-23 [1] RSPM (R 3.6.3)
magrittr 1.5 2014-11-22 [1] RSPM (R 3.6.0)
memoise 1.1.0 2017-04-21 [1] RSPM (R 3.6.0)
mime 0.9 2020-02-04 [1] RSPM (R 3.6.0)
modelr 0.1.5 2019-08-08 [1] RSPM (R 3.6.0)
munsell 0.5.0 2018-06-12 [1] RSPM (R 3.6.0)
nlme 3.1-144 2020-02-06 [2] CRAN (R 3.6.3)
packrat 0.5.0 2018-11-14 [1] RSPM (R 3.6.0)
pkgbuild 1.0.8 2020-05-07 [1] RSPM (R 3.6.0)
pkgconfig 2.0.3 2019-09-22 [1] RSPM (R 3.6.0)
pkgload 1.1.0 2020-05-29 [1] RSPM (R 3.6.0)
png 0.1-8 2020-01-17 [1] local
prettyunits 1.1.1 2020-01-24 [1] RSPM (R 3.6.0)
processx 3.4.2 2020-02-09 [1] RSPM (R 3.6.0)
promises 1.1.0 2019-10-04 [1] RSPM (R 3.6.0)
ps 1.3.3 2020-05-08 [1] RSPM (R 3.6.0)
purrr * 0.3.3 2019-10-18 [1] RSPM (R 3.6.0)
R6 2.4.1 2019-11-12 [1] RSPM (R 3.6.0)
Rcpp 1.0.3 2019-11-08 [1] RSPM (R 3.6.0)
RCurl 1.98-1.2 2020-04-18 [1] RSPM (R 3.6.3)
readr * 1.3.1 2018-12-21 [1] CRAN (R 3.5.0)
readxl 1.3.1 2019-03-13 [1] RSPM (R 3.6.0)
remotes 2.1.1 2020-02-15 [1] RSPM (R 3.6.0)
reprex 0.3.0 2019-05-16 [1] RSPM (R 3.6.0)
rlang 0.4.6 2020-05-02 [1] RSPM (R 3.6.0)
rmarkdown 2.0 2019-12-12 [1] RSPM (R 3.6.0)
RoogleVision * 0.0.1.1 2020-07-03 [1] Github (shaun-jacks/RoogleVision@6c2909d)
rprojroot 1.3-2 2018-01-03 [1] RSPM (R 3.6.0)
rsconnect 0.8.16 2019-12-13 [1] RSPM (R 3.6.0)
rstudioapi 0.11 2020-02-07 [1] RSPM (R 3.6.0)
sessioninfo 1.1.1 2018-11-05 [1] RSPM (R 3.6.0)
shiny * 1.5.0 2020-06-23 [1] CRAN (R 3.6.3)
shinycssloaders * 0.3 2020-01-16 [1] RSPM (R 3.6.3)
shinydashboard 0.7.1 2018-10-17 [1] RSPM (R 3.6.3)

[1] /home/R/x86_64-pc-linux-gnu-library/3.6
[2] /opt/R/3.6.3/lib/R/library
Warning message:
In system("timedatectl", intern = TRUE) :
running command 'timedatectl' had status 1

I badly need experts' suggestions on this. Kindly help me with this issue.