@Override
	public void close() {
		for (Program prog : loadedPrograms.values()) {
			prog.release(this);
		}
		programsToFix.clear();
		loadedPrograms.clear();
	}
Returns true if there was an error encountered when trying to open an external library.

@return boolean flag, true if there was a problem opening an external library
Ghidra/Features/Base/src/main/java/ghidra/program/util/ExternalSymbolResolver.java