Could someone help me fix this error?

Spoiler for Error:
Code:
starting...
src\Class466.java:6: error: package netscape.javascript does not exist
import netscape.javascript.JSObject;
                          ^
src\Class457.java:78: warning: Win32GraphicsDevice is internal proprietary API a
nd may be removed in a future release
                                Field field = sun.awt.Win32GraphicsDevice.class.
getDeclaredField("valid");
                                                     ^
src\Class457.java:93: warning: Win32GraphicsDevice is internal proprietary API a
nd may be removed in a future release
                                                Field field = sun.awt.Win32Graph
icsDevice.class.getDeclaredField("valid");
                                                                     ^
src\Class457.java:103: warning: Win32GraphicsDevice is internal proprietary API
and may be removed in a future release
                                        Field field = sun.awt.Win32GraphicsDevic
e.class.getDeclaredField("valid");
                                                             ^
src\Class110_Sub1.java:14: warning: Unsafe is internal proprietary API and may b
e removed in a future release
        long aLong8597;
                ^
src\Class_ra_Sub3.java:35: warning: Unsafe is internal proprietary API and may b
e removed in a future release
        public Unsafe anUnsafe8219;
               ^
src\Class_ra_Sub3.java:5: warning: Unsafe is internal proprietary API and may be
 removed in a future release
import java.nio.ByteBuffer;
             ^
src\Class_ra_Sub3.java:2864: warning: Unsafe is internal proprietary API and may
 be removed in a future release
                                Field field = sun.misc.Unsafe.class.getDeclaredF
ield("theUnsafe");
                                                      ^
src\Class_ra_Sub3.java:2866: warning: Unsafe is internal proprietary API and may
 be removed in a future release
                                anUnsafe8219 = (Unsafe) field.get(null);
                                                ^
src\Class387_Sub3.java:157: warning: Unsafe is internal proprietary API and may
be removed in a future release
                Unsafe unsafe = ((Class387_Sub3) this).aClass_ra_Sub3_7894.anUns
afe8219;
                ^
src\Class387_Sub3.java:2636: warning: Unsafe is internal proprietary API and may
 be removed in a future release
                        Unsafe unsafe = ((Class387_Sub3) this).aClass_ra_Sub3_78
94.anUnsafe8219;
                        ^
src\Class387_Sub3.java:2668: warning: Unsafe is internal proprietary API and may
 be removed in a future release
                        Unsafe unsafe = ((Class387_Sub3) this).aClass_ra_Sub3_78
94.anUnsafe8219;
                        ^
src\Class387_Sub3.java:2815: warning: Unsafe is internal proprietary API and may
 be removed in a future release
                        Unsafe unsafe = ((Class387_Sub3) this).aClass_ra_Sub3_78
94.anUnsafe8219;
                        ^
src\Class387_Sub3.java:2854: warning: Unsafe is internal proprietary API and may
 be removed in a future release
                        Unsafe unsafe = ((Class387_Sub3) this).aClass_ra_Sub3_78
94.anUnsafe8219;
                        ^
src\Class466.java:11: error: cannot find symbol
                        JSObject.getWindow(applet).eval(string);
                        ^
  symbol:   variable JSObject
  location: class Class466
src\Class466.java:19: error: cannot find symbol
                        return JSObject.getWindow(applet).call(string, null);
                               ^
  symbol:   variable JSObject
  location: class Class466
src\Class466.java:27: error: cannot find symbol
                        return JSObject.getWindow(applet).call(string, objects);

                               ^
  symbol:   variable JSObject
  location: class Class466
src\Class481_Sub1.java:74: warning: AuthenticationInfo is internal proprietary A
PI and may be removed in a future release
                                        Class var_class = sun.net.www.protocol.h
ttp.AuthenticationInfo.class;

   ^
Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
4 errors
14 warnings
Press any key to continue . . .