[R] no possible to load a package correctly dowloaded by the R prompt

Please, help me. I had a trouble in downloading from CRAN the package "untb". Everything seems to work. I type >install.packages(c(untb)) after selecting the CRAN mirror and I get a message of successful downloading. Indeed I have the package in the library and if I check with command >

[R] (no subject)

Please, help me. I had a trouble in downloading from CRAN the package "untb". Everything seems to work. I type >install.packages(c(untb)) after selecting the CRAN mirror and I get a message of successful downloading. Indeed I have the package in the library and if I check with command >