Very good kata. I had to challenge myself and I learned some new aspects of the language. Kudos!

I see a lot of comments stating that a simple brute force solution would do the job.
In Pascal it does not. It is required some sort of code optimization in order to avoid the timeout.
Nice kata.

I tried resetting the kata and pressing the 'ATTEMPT' button. I am still getting the same error. Instead, the 'TEST' button works just fine.

CODE:

unit Kata;

interface

function Decomp(n: Int64): String;

implementation

function Decomp(n: Int64): String;

begin

// your code

Result := '';

end;

end.

LOG:

Free Pascal Compiler version 3.2.0 [2020/06/14] for x86_64

Copyright (c) 1993-2020 by Florian Klaempfl and others

KataTests.pas(52,3) Error: Type mismatch

KataTests.pas(94) Fatal: There were 1 errors compiling module, stopping

Fatal: Compilation aborted

Error: /usr/bin/ppcx64 returned an error exitcode

I completed the kata. All the tests passes without errors.
When I attempt to send my solution, I get:

Free Pascal Compiler version 3.2.0 [2020/06/14] for x86_64
Copyright (c) 1993-2020 by Florian Klaempfl and others
KataTests.pas(52,3) Error: Type mismatch
KataTests.pas(94) Fatal: There were 1 errors compiling module, stopping
Fatal: Compilation aborted
Error: /usr/bin/ppcx64 returned an error exitcode

Might there be some problems with the tests?