;Program:        KeygenTemplate
;Author:         Clockowl
;Description:    Keygen template for crackmes
;                Thanks goto tgrysztar and LocoDelAssembly 

format PE GUI 4.0
entry start

include 'win32a.inc'

section '.data' data readable writeable
  IDKEY  = 101
  IDNAME = 102
  IDGEN  = 103
  IDEXIT = 104

section '.code' code readable executable

  start: dummy = InitCommonControls
        invoke  GetModuleHandle,0
        invoke  DialogBoxParam,eax,37,HWND_DESKTOP,DialogProc, 0
        or      eax,eax
        jz      exit
  exit:
        invoke  ExitProcess,0

proc DialogProc hwnddlg,msg,wparam,lparam
        push    ebx esi edi
        cmp     [msg],WM_INITDIALOG
        je      wminitdialog
        cmp     [msg],WM_COMMAND
        je      wmcommand
        cmp     [msg],WM_CLOSE
        je      wmclose
        xor     eax,eax
        jmp     finish
  wminitdialog:
        jmp     processed
  wmcommand:
        cmp     [wparam],BN_CLICKED shl 16 + IDEXIT
        je      wmclose
        cmp     [wparam],BN_CLICKED shl 16 + IDOK
        jmp     processed
  wmclose:
        invoke  EndDialog,[hwnddlg], 0
  processed:
        mov     eax, 1
  finish:
        pop     edi esi ebx
        ret

endp

section '.idata' import data readable writeable

  library kernel,'KERNEL32.DLL',\
          user,'USER32.DLL',\
          comctl,'COMCTL32.DLL'

  import  kernel,\
          GetModuleHandle,'GetModuleHandleA',\
          ExitProcess,'ExitProcess'

  import  user,\
          DialogBoxParam,'DialogBoxParamA',\
          GetDlgItemText,'GetDlgItemTextA',\
          MessageBox,'MessageBoxA',\
          EndDialog,'EndDialog'

  import  comctl,\
          InitCommonControls,'InitCommonControls'

section  '.rsrc' resource data readable

  directory 24,manifest,\
            RT_DIALOG,dialogs

  resource manifest,\
         1,LANG_ENGLISH+SUBLANG_DEFAULT,man

  resource dialogs,\
           37, LANG_ENGLISH+SUBLANG_DEFAULT,mydialog

  dialog mydialog,'Clockowl - First KeyGens',6,5,242,66,10C00800h,00000088h
    dialogitem 'EDIT','Enter your desired username',IDNAME,4,5,230,15,10800101h
    dialogitem 'EDIT','Hit generate to generate a key',IDKEY,4,25,230,15,10800901h
    dialogitem 'BUTTON','&Generate',IDGEN,152,46,82,13,50010000h
    dialogitem 'BUTTON','E&xit',IDEXIT,4,46,82,13,50010000h
  enddialog

resdata man
  db '<?xml version="1.0" encoding="UTF-8" standalone="yes"?>',\
     '<assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0">',\
     ' <assemblyIdentity version="1.0.0.0" processorArchitecture="X86" name="CompanyName.ProductName.YourApp" type="win32"/>',\
     ' <description>First KeyGen</description>',\
     ' <dependency>',\
     '  <dependentAssembly>',\
     '   <assemblyIdentity type="win32" name="Microsoft.Windows.Common-Controls" version="6.0.0.0" processorArchitecture="X86" publicKeyToken="6595b64144ccf1df" language="*"/>',\
     '  </dependentAssembly>',\
     ' </dependency>',\
     '</assembly>'
endres    

remove from your code empty section
[section '.data' data readable writeable]
and it will work.