After redesigning my Poject I have the following Projectfile:

[Petter <petter_fryklund@hotmail.com>]

with "..\..\..\..\GNAT\2021\share\gpr\gnatcoll.gpr";
with "../Utilities/utilities.gpr";

project Ugroups is

   type Build_Kind is
     ("static", "relocatable", "static-pic");
   
   for Object_Dir use "obj";
   for Main use ("main.adb");
   GPR_BUILD : Build_Kind := external ("GPR_BUILD");

   package Compiler is
      for Switches ("ada") use ("-g");
   end Compiler;

   package Linker is
      for Switches ("ada") use ("-g");
   end Linker;

   package Ide is
      for Vcs_Kind use "git";
   end Ide;

   case GPR_BUILD is

      when "static" =>
         for Source_Dirs use ("src");

      when "relocatable" =>
         for Source_Dirs use ("src");

      when "static-pic" =>
         for Source_Dirs use ("src);
   end case;

end Ugroups;

When trying to build All  Iget the following error:
2023-11-17 02:59:24] Could not locate executable on path: .
[2023-11-17 02:59:24] process exited with status -1, elapsed time: 00.41s

Any Suggestions?