# Can't add interface to Blueprint **URL:** \ **Category:** UI\ **Tags:** interface, how-can-i-fix-this, interfaces, add, unreal-engine, Blueprint, question\ **Created:** [March 26, 2015, 7:31pm UTC](https://forums.unrealengine.com/t/cant-add-interface-to-blueprint/312729 "2015-03-26T19:31:02Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![anonymous\_user\_276962d7](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_276962d7](https://forums.unrealengine.com/u/anonymous_user_276962d7)\ **Post date:** [March 26, 2015, 7:31pm UTC](https://forums.unrealengine.com/t/cant-add-interface-to-blueprint/312729/1 "2015-03-26T19:31:02Z")
After I had deleted my interface from a blueprintclass, I can’t add it again. interface is still visible in “Add interface window” but when click it, nothing happens. Does anyone have an idea how I can fix that? ---
**Author:** ![anonymous\_user\_33800a51](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_33800a51](https://forums.unrealengine.com/u/anonymous_user_33800a51)\ **Post date:** [March 26, 2015, 9:04pm UTC](https://forums.unrealengine.com/t/cant-add-interface-to-blueprint/312729/2 "2015-03-26T21:04:33Z")
Hi Hensen89, I wasn’t able to reproduce this in 4.7.3. Does this happen in a new project, or only your current project. Are you able to reproduce this problem in a new Blueprint with a new Blueprint Interface? Can you list steps you take to see this happen? Thanks! ---
**Author:** ![anonymous\_user\_33800a51](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_33800a51](https://forums.unrealengine.com/u/anonymous_user_33800a51)\ **Post date:** [March 30, 2015, 9:42pm UTC](https://forums.unrealengine.com/t/cant-add-interface-to-blueprint/312729/3 "2015-03-30T21:42:24Z")
Hi Hensen89, We haven’t heard back from you in a while, so I’m resolving this post for tracking purposes. If you’re still experiencing this issue, please feel free to reply with information requested above and we will renew our investigation. Thanks! ---
**Author:** ![anonymous\_user\_276962d7](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_276962d7](https://forums.unrealengine.com/u/anonymous_user_276962d7)\ **Post date:** [April 1, 2015, 8:45pm UTC](https://forums.unrealengine.com/t/cant-add-interface-to-blueprint/312729/4 "2015-04-01T20:45:51Z")
Hi , I had to reconstruct Blueprint and now it works. I never had problem again. Thanks for your help and excuse my late answer, ---
**Author:** ![anonymous\_user\_7c7f1e04](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_7c7f1e04](https://forums.unrealengine.com/u/anonymous_user_7c7f1e04)\ **Post date:** [May 29, 2015, 2:35am UTC](https://forums.unrealengine.com/t/cant-add-interface-to-blueprint/312729/5 "2015-05-29T02:35:06Z")
I know this is an old topic, but I stumbled on it while trying to figure out same issue I had. My solution was to manually delete functions that interface implements before re-adding interface to your blueprint. ---
**Author:** ![anonymous\_user\_050e9b2f](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_050e9b2f](https://forums.unrealengine.com/u/anonymous_user_050e9b2f)\ **Post date:** [July 24, 2016, 8:40am UTC](https://forums.unrealengine.com/t/cant-add-interface-to-blueprint/312729/6 "2016-07-24T08:40:49Z")
I had same problem (4.12.5), at first I was able to add an Interface to my BP, then I’ve deleted it accidentally, and in following I wasn’t able to add it again (just nothing happened when I clicked on it). "timetravel"s trick with manually deleting functions in interface worked 🙂 ---
**Author:** ![anonymous\_user\_a18519b6](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_a18519b6](https://forums.unrealengine.com/u/anonymous_user_a18519b6)\ **Post date:** [November 3, 2016, 6:22pm UTC](https://forums.unrealengine.com/t/cant-add-interface-to-blueprint/312729/7 "2016-11-03T18:22:21Z")
Old thread, but may help someone…issue is most often that you have a function name in your actor that has same name as an interface function name. If that happens, then you will get no error, warning or anything…but interface will simply not be included in your class when you select it from drop down. There should be an error but there isn’t. ---
**Author:** ![anonymous\_user\_2709d010](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@anonymous\_user\_2709d010](https://forums.unrealengine.com/u/anonymous_user_2709d010)\ **Post date:** [April 11, 2017, 9:18am UTC](https://forums.unrealengine.com/t/cant-add-interface-to-blueprint/312729/8 "2017-04-11T09:18:33Z")
Also, after you delete colliding function in BP you need to recompile before you can add interface ---
**Author:** ![JTXPbrah](https://d3kjluh73b9h9o.cloudfront.net/original/4X/2/8/5/28502927f1d97ba1051b3b47ccfe17233bf41ef0.png) [@JTXPbrah](https://forums.unrealengine.com/u/JTXPbrah)\ **Post date:** [May 28, 2018, 12:33am UTC](https://forums.unrealengine.com/t/cant-add-interface-to-blueprint/312729/9 "2018-05-28T00:33:19Z")
This is definitely a bug that should be reported. Easy fix is to just duplicate your blueprint and interface will add. Delete original BP and rename new one.