libprotobuf.so.19: cannot open shared object file: No such file or directory

This error message usually occurs when the system is unable to locate the shared object file `libprotobuf.so.19`.

To resolve this issue, you can try the following steps:

1. Check if the `libprotobuf.so.19` file exists on your system. You can use the `find` command to search for it:

   find / -name libprotobuf.so.19

2. If the file is found, make sure its directory is included in the `LD_LIBRARY_PATH` environment variable. You can add it using the following command:

   export LD_LIBRARY_PATH=/path/to/libprotobuf.so.19:$LD_LIBRARY_PATH

3. If the file is not found on your system, you may need to install or update the protobuf library. The method to install or update it depends on your operating system and package manager. For example, on Ubuntu, you can use the following command to install protobuf:

   sudo apt-get install libprotobuf-dev

4. After installing or updating protobuf, try running your program again to see if the issue is resolved.

If you're still facing issues after trying these steps, please provide more details about your system and the context in which this error occurs so that I can assist you further.