# Unable to Delete a Persistent Verse Code After Publishing **URL:** \ **Category:** Issues and Bug Reporting\ **Tags:** fortnite-creative, unreal-editor-for-fortnite, bug-report, fortnite\ **Created:** [February 10, 2025, 12:52pm UTC](https://forums.unrealengine.com/t/unable-to-delete-a-persistent-verse-code-after-publishing/2325616 "2025-02-10T12:52:28Z")\ **Posts on this page:** 1\ **Showing post:** 4
**Author:** ![Mineblo](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/mineblo/32/1203575_2.png) [@Mineblo](https://forums.unrealengine.com/u/Mineblo)\ **Post date:** [February 11, 2025, 4:10am UTC](https://forums.unrealengine.com/t/unable-to-delete-a-persistent-verse-code-after-publishing/2325616/4 "2025-02-11T04:10:54Z")
@matthieuftmytb22 From [Using Persistable Data in Verse | Unreal Editor for Fortnite Documentation | Epic Developer Community](https://dev.epicgames.com/documentation/en-us/uefn/using-persistable-data-in-verse) : > [@](#): > > After you have published the current version of your island, if you make updates to the persistable data, any stored data from a previous version of the island must be supported in later versions of the island. > > To ensure this, a backwards compatibility check is run in UEFN and a compilation failure occurs if the Verse code is no longer compatible with the currently published version. This backwards compatibility check is run whenever you: It seems like an intentional feature rather than a bug, I would like though some feature to reset weak\_maps in case of a mess up. However someone found this possible workaround as per this thread [How To Remove weak\_map From Project](https://forums.unrealengine.com/t/how-to-remove-weak-map-from-project/2325019) , I haven’t personally tested it myself but according to the thread creator they were able to revert to a published version from before the persistence data was added, and then the errors were not showing up, essentially letting them re-set and re-write a new weak\_map, good luck. Alternatively if you prefer to just recover the verse code you previously used that had the layout matching the one in the published version so the error can go you can follow the steps in this other thread [Help pls problem with verse - #11 by Mineblo](https://forums.unrealengine.com/t/help-pls-problem-with-verse/2297716/11) to find the different verse codes from different versions of your map and copy it back into your project --- _[View the full topic](https://forums.unrealengine.com/t/unable-to-delete-a-persistent-verse-code-after-publishing/2325616)._