Adding existing unit to project shows error

[heejit]

Code: Pascal  [Select][+][-]

1. Attached : Screenshot
2.  
3. Lazarus : 2.1
4. FPC       : 3.3.1
5. SVN REVISION : 59293
6.  

[howardpc]

Without sight of the code leading to the conflict it is impossible to say for sure.
However, one likely possibility is creation order mismatch.

The project from which you are importing a gui unit may have initialised gui controls in a different order than the creation order a simple import (without any adaptation) imposes.
Any reference(s) to properties of objects that are not yet created is bound to produce such errors.

[heejit]

following is unit code which I am trying  to add into my project

Code: Pascal  [Select][+][-]

1. unit unit_gui;
2.  
3. {$mode objfpc}{$H+}
4.  
5. interface
6.  
7. uses
8.   Classes, SysUtils, Forms;
9.  
10. function get_current_exe_path_dir(): string;
11.  
12. implementation
13.  
14. function get_current_exe_path_dir(): string;
15. begin
16.   Result :=  ExtractFileDir(Application.ExeName);
17. end;
18.  
19. end.
20.  
21.  

[heejit]

I have added unit-folder to project-unit-path and it is working