Forms :: FRM-40734 Internal Error?

Problem is one form that i have to migrate from version 6 throu 6i I got very difficult (for me) error FRM-40734. Happens In WHEN-NEW-FORM-INSTANCE trigger when i try do go_block('NAVI');NAVI block is NOT database block (property set NO)

Database Oracle Database 10g Release 10.2.0.4.0
Forms 11.1.2.0.0,

Below i post some code

When-New-Form-Instance trigger
....some other code
navi_pck.link_activated();
... some other code
navi_pck.Init();
... some other code

Navi_pck is a package added to program modules

PACKAGE BODY navi_pck IS
type t_navi_data is record
( name varchar2(64),
primary_item varchar2(64),

[code]...

When When-New-Instance-Form fires on line navi_pck.link_activated(); we go to init(); in navi_pck packageeverything is ok - that mean it is executed without any errorthen when we hit navi_pck.Init();we got error at Bold line => go_block(g_block); that is error not exception (because adding begin... exception when others ... end; does not catch it)

Of course its needed to be done -> mean that go_block, because after it we clear block and work on it.I got 5 triggers on that block NAVE - but tried already to NULL theirs code but didnt solve the problem (didnt try to remove them...)