# (Blocker) Cant launch a session in UEFN

**URL:** <https://forums.unrealengine.com/t/blocker-cant-launch-a-session-in-uefn/827972>\
**Category:** Issues and Bug Reporting\
**Tags:** unreal-editor-for-fortnite, question, fortnite\
**Created:** [March 27, 2023, 4:28pm UTC](https://forums.unrealengine.com/t/blocker-cant-launch-a-session-in-uefn/827972 "2023-03-27T16:28:31Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![HalcyonKnight96](https://d1ap1mz92jnks1.cloudfront.net/user_avatar/forums.unrealengine.com/halcyonknight96/32/924312_2.png) [@HalcyonKnight96](https://forums.unrealengine.com/u/HalcyonKnight96)\
**Post date:** [March 27, 2023, 4:34pm UTC](https://forums.unrealengine.com/t/blocker-cant-launch-a-session-in-uefn/827972/2 "2023-03-27T16:34:32Z")

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[[Critical] Can't start a session because of validation error for "misallowed" objects](https://forums.unrealengine.com/t/critical-cant-start-a-session-because-of-validation-error-for-misallowed-objects/820029) Same issue as here. If you could DM me your project files that would be a big help.

Edit: Some more information on what you’re doing and what is in your project would be helpful too.

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_[View the full topic](https://forums.unrealengine.com/t/blocker-cant-launch-a-session-in-uefn/827972)._