[fpc-pascal]trouble compiling a demo

[Crabtree, Chad]

I am trying to compile this which is giving me hell

unit MyError;

{
  Custom error reporting routines.
  
     *** WINDOWS VERSION ***
}

interface

procedure Say(msg : String);
procedure SockError(msg : String);
procedure SockSay(msg : String);
procedure GenError(msg : String);implementation

uses sockets;

procedure Say(msg : String);
begin
   Writeln(stderr, msg);
end;

procedure SockError(msg : String);
begin
   Writeln(stderr, msg, SocketError);
   Halt(1);
end;

procedure SockSay(msg : String);
begin
   Writeln(stderr, msg, SocketError);
end;

procedure GenError(msg : String);
begin
   Say(msg);
   Halt(1);
end;

end.

The error message is this.  I am new to this so I am having trouble
understanding what's wrong.  the error message is

myerror-win.pas(1,6) Error: Illegal unit name: MYERROR
myerror-win.pas(9,1) Fatal: Syntax error, ; expected but INTERFACE found
>Exit code: 1

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