returns the system-dependent error message from loading a library, or None if there was no error.
To use $LibraryError, you can load it using Needs["LibraryLink`"].
The information returned by $LibraryError depends on the system on which it is run.
This finds a sample library to use to demonstrate library loading problems:
The library has dependencies on other libraries. Normally, the Wolfram Language will load the other libraries first. However, if you just try to load the calendar library directly (and you have not already used a calendar function) this load instruction will fail:
You can use $LibraryError to find out more about the error:
Windows does not give the names of dependent libraries that cannot be found. On other platforms this information is available.