# Problems encountered when Ghost 4 was downgraded and imported to Ghost 3

**URL:** <https://forum.ghost.org/t/problems-encountered-when-ghost-4-was-downgraded-and-imported-to-ghost-3/27117>\
**Category:** Developer help\
**Created:** [December 2, 2021, 8:59am UTC](https://forum.ghost.org/t/problems-encountered-when-ghost-4-was-downgraded-and-imported-to-ghost-3/27117 "2021-12-02T08:59:14Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![heshanfu](https://sea1.discourse-cdn.com/flex015/user_avatar/forum.ghost.org/heshanfu/32/1855_2.png) [@heshanfu](https://forum.ghost.org/u/heshanfu)\
**Post date:** [December 2, 2021, 8:59am UTC](https://forum.ghost.org/t/problems-encountered-when-ghost-4-was-downgraded-and-imported-to-ghost-3/27117/1 "2021-12-02T08:59:15Z")

</div>

Ghost 4 is all i don’t want , And When I imported the json file from ghost3.0, I encountered a problem. Is there any solution?

Import failed

Validation (isIn) failed for type

{“group”:“core”,“key”:“db\_hash”,“value”:“448c9235-5933-479f-a332-58641f71daca”,“type”:“string”,“flags”:null,“created\_at”:“2021-05-06 10:07:44”,“updated\_at”:“2021-05-06 10:07:44”}

 ![Snipaste_2021-12-02_16-58-42](https://us1.discourse-cdn.com/flex015/uploads/ghost2/original/2X/d/dd14c9b36f9b29eab0f5783cf22b269974f139c6.jpeg)