AX Strange Errors

Today, when I started AX, I got some strange errors each time like:


Object Server 01: Dialog issued for client-less session 1: Error executing code: SysCheckList_Setup object does not have method 'isSetupMode'.
Stack trace
(S)\Classes\SysCheckList_Setup\isSetupMode
(S)\Classes\Application\isRunningMode - line 5
(S)\Classes\Application\dbSynchronize - line 12
(S)\Classes\Application\syncApplTables - line 5
(S)\Classes\Application\new - line 6


Object Server 01: Dialog issued for client-less session 1: Error executing code: object does not have method 'main'.
Stack trace
(S)\Classes\\main


Object Server 01: I/O Error 38 (OS error ) occured when session 3 accessed E:\Program Files\Microsoft Dynamics AX\40\Application\appl\standard\axapd.aoi. User chose to retry.

Solution:

Stopped AOS Service
Deleted axapd.aoi file in application folder
Restart AOS Service
Start AX