libpng12.so.0: cannot open shared object file: No such file or directory

This error message usually occurs when the system is unable to find the required shared library file, libpng12.so.0, during runtime. This library is related to the PNG image format.

To resolve this, you can follow these steps:

1. Check if the libpng12 package is installed on your system. You can do this by running the following command:

   dpkg -l | grep libpng12

If the package is not found, you can install it using the package manager specific to your Linux distribution. For example, on Ubuntu, you can run:

   sudo apt-get install libpng12-0

2. If the package is already installed, but the shared library file is still missing, it might be due to a version mismatch. In such cases, you can try creating a symlink to a compatible version of the library. For example, if you have libpng12.so.0.50.0 available, you can create a symlink as follows:

   sudo ln -s /usr/lib/libpng12.so.0.50.0 /usr/lib/libpng12.so.0

3. After performing the above steps, try running your program again. It should be able to find the libpng12.so.0 library and execute without any issues.

Please note that the specific steps may vary depending on your Linux distribution and version.