Hi @Vladimir_G 

Please try the following steps outlined in the troubleshooting section of docs.

https://documentation.commvault.com/2022e/expert/21723_backup_troubleshooting.html

• To locate the lib directory, run the following command:

  bash-3.2# ./pg_config --libdir

  Example output:

  /PostgreSQL/9.2/lib

  If pg_config is not present which is installed as part of PostgreSQL install, run the following command (on UNIX clients):

  bash-3.2# locate libpq.so

  Example output:

  /PostgreSQL/9.2/lib/libpq.so

• If the lib path contains libpq.so.x.x instead of libpq.so, create a symlink libpq.so to libpq.so.x.x before attempting instance creation.

  For example:

  On some setups libpq.so may not be present, but there will be a numbered version like libpq.so.4 or libpq.so.5.

  In this case, create a symlink version of libpq.so pointing to the numbered one:

  bash-3.2# ln -s /usr/lib64/libpq.so.x.x /usr/lib64/libpq.so

  You should be able to create instance successfully now.

Note: Library directory might differ for different setups. Find the proper library directory to create a soft link.

my problem was that I specified the wrong path for the libraries and for the executable files, now I managed to make a backup copy. thanks for answering me!