404 page while I import

[Idan747]

Type of import (clean or merge): merge.
Source board system and version: ipb 1.3.1
Target version: vb 3.6.7
Module issue occurred on: import threads and posts (million of posts)....

[Idan747]

I getting 404 page during the import of the threads and posts from my old board.
when I refresh the page the import continue but after a few minute I getting the 404 page again.
I've tried...