What are the two errors android studio gives?

Question

android studio

When compiling the application, it gives two errors

Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: C:\Users\Viktor\AndroidStudioProjects\FacebookVideoDownloader\app\src\main\java\com\buratinoapps\facebookvideodownloader\GalleryActivity.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.

Second error

Cannot fit requested classes in a single dex file