[Lazarus] LongString does not work?

[Xiangrong Fang]

Hi All,

This does not work:

  TConfiguration = record
    DataFolder: string[MaxPathLen];
  end

Error: string length must be a value from 1 to 255

I already have this on the top of my uinit file: {$mode
objfpc}{$H+}{$LONGSTRINGS ON}

Working with Lazarus 1.0.6/FPC2.6.0 on Linux 3.5/x86_64

Any hint please? Thanks!
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