Uncaught exception - std@sys_read_dir (closed solution does not work for me)

Almost exactly the same setup as https://github.com/HaxeFoundation/as3hx/issues/46

```
neko run.n source/as3/ out/
Called from sys.io.FileOutput::$statics line 1
Called from Run::main line 102
Called from Run::loop line 33
Called from sys.FileSystem::readDirectory line 85
Uncaught exception - std@sys_read_dir
```

I tried to leave out the out/ I get:

```
Usage: as3tohx [options] sourceDir [outdir]
Options:
-no-cast-guess as3tohx will not try to handle MyClass(obj) casts
-no-func2dyn will not change Function types to Dynamic
-uint2int transforms all uint to Int
-vector2array will convert Vectors to haxe Arrays
-debug-expr will output debug information
-debug-inferred-type will output inferred type debug information
-convert-flexunit will convert FlexUnit metadata and calls to munit form
outdir defaults to './out'
```

Do you know any other solution that could help? When I use the haxelib released version (1.0.2) it works.

Reproduce `neko run.n source/as3/ out/` and compare it with the working haxelib 1.0.2 version. Start with the `Run::main`, `Run::loop`, and `sys.FileSystem::readDirectory` locations shown in the traceback, then determine why the checked-out version fails while the released version succeeds. Done means the reported conversion command runs successfully with the stated inputs.

Written by the indexing model from the issue text.