You may need to tell Eagle to “Use” the library via the Control Panel to be able to access it.
The SparkX library only contains the SparkX logo. Really, it should be in SparkFun-Aesthetics but nobody has ever got around to putting it in there!
You can create the library for yourself if you want to. Use the Control Panel to create a new library. Open it using Control Panel. Then switch to the schematic, right-click on the logo and use “Copy DEVICE To Library” to copy it into the library. Save your new library. Close it. Use Control Panel to “Use” your new library. Go to the schematic, right-click on the logo and use the “Replace” option to replace it with the copy from your new library.