Access encountered error: ERR_NOT_FOUND under APM log

Hi there

Recently i'm getting under /var/log/apm a lot of error messages as the following:

Jan 18 10:11:14 Main err tmm3[19684]: 01490514:3: (null):Common:00000000: Access encountered error: ERR_NOT_FOUND. File: ../modules/hudfilter/access/access.c, Function: hud_access_handler, Line: 2533 Jan 18 10:11:14 Main err tmm2[19684]: 01490514:3: (null):Common:00000000: Access encountered error: ERR_NOT_FOUND. File: ../modules/hudfilter/access/access.c, Function: access_save_init_req_to_sessiondb, Line: 15741 Jan 18 10:11:14 Main err tmm2[19684]: 01490514:3: (null):Common:00000000: Access encountered error: ERR_NOT_FOUND. File: ../modules/hudfilter/access/access.c, Function: access_process_state_client_wait_for_req_body, Line: 3444

Does anyone encountered this messages or has any idea what can be the reason for it ?

Thanks!