* installing *source* package ‘T.TTest’ ...
** using staged installation
** R
** byte-compile and prepare package for lazy loading
Error in setwd("~/Desktop/Paketləmə/T.TTest") : 
  cannot change working directory
Error: unable to load R code in package ‘T.TTest’
Execution halted
ERROR: lazy loading failed for package ‘T.TTest’
* removing ‘/srv/hornik/tmp/CRAN/T.TTest.Rcheck/T.TTest’