What is the meaning of the error message "sqlplus: error while loading shared libraries: libsqlplus.so: cannot open shared object file: No such file or directory"?

edit

The error message means that the sqlplus program is unable to find and load a required shared library file called libsqlplus.so. The file may be missing, corrupt or may not have appropriate permissions. It could also be possible that the library file is located in a directory that is not included in the system's library path.