error while loading shared libraries: libpaho-mqtt3a.so.1:

The error "error while loading shared libraries: libpaho-mqtt3a.so.1" indicates that the system is unable to find the shared library libpaho-mqtt3a.so.1 at runtime. Here are a few steps you can take to resolve this issue:

1. Check if the library is installed: Verify that the libpaho-mqtt3a library is installed on your system. If it is not installed, you will need to install it before proceeding. You can usually install it using a package manager like apt, yum, or homebrew.

2. Update library path: If the library is installed but the system cannot find it, you may need to update the library path. You can do this by adding the library path to the LD_LIBRARY_PATH environment variable. For example:

3. Refresh dynamic linker cache: After updating the library path, you should refresh the dynamic linker cache using the ldconfig command. For example:

4. Verify the library version: Double-check that the library version you are trying to load matches the one installed on your system. If there is a mismatch, you may need to recompile your code against the correct version of the library.

If you are still experiencing issues after following these steps, please provide more information about your development environment and how you are running your code so that I can assist you further.