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From: ldries46 <bertus.dries@planet.nl>
Subject: unknown error mesage
Date: Tue, 16 Mar 2021 18:49:21 +0100
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During debugging an Ada program when building a new version I got the 
following message:

gprbuild -d -PD:\ada\project\Datum\Datum.gpr -j8
Bind
    [gprbind]      datum.bexch
    [Ada]          datum.ali
fatal error: file gtk.ali is incorrectly formatted
make sure you are using consistent versions of gcc/gnatbind
56.  G a e
       |
gprbind: invocation of gnatbind failed
gprbuild: unable to bind datum.adb
[2021-03-16 18:40:50] process exited with status 4, 100% (63/63), 
elapsed time: 02.63s

I have already deleted all .ali files in the build directory, deleted 
the Datum.exe file, reinstalled GtkAda en even reinstalled GNAT Studio 
Community version 2020.

Who can tell me what is message means and how to eliminate that