# BFX bug?

**URL:** <https://forum.logik.tv/t/bfx-bug/11683>\
**Category:** Flame Questions\
**Tags:** bfx\
**Created:** [November 4, 2024, 1:58pm UTC](https://forum.logik.tv/t/bfx-bug/11683 "2024-11-04T13:58:26Z")\
**Posts on this page:** 6\
**Page:** 1

<div class="post-metadata">

**Author:** ![Lightningad](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.logik.tv/lightningad/32/2191_2.png) [@Lightningad](https://forum.logik.tv/u/Lightningad)\
**Post date:** [November 4, 2024, 1:58pm UTC](https://forum.logik.tv/t/bfx-bug/11683/1 "2024-11-04T13:58:26Z")

</div>

having a very weird problem inside a BFX. I’m running Flame 25.1.2 on a mac pro 13.6.3.

I have been working in the BFX everything doind what i need, yet when i try exit, i get error message “Batch: Cannot exit BFX1:mop1: Node mop1 must have input matte.”

I have no nodes called mop1, i have tried adding a matte input to any node that currently does not have one, yet nothing resolves the issue. I cannot exit batch and i can’t fix the issue because i dont have the node that Flame says is the problem.

Any know whats going on?

 ![Screenshot 2024-11-04 at 13.51.15](https://us1.discourse-cdn.com/flex020/uploads/thedepartmentofexternalservices/original/2X/6/6a93ce655706d558e1acc3f4761f60150da9e0c9.jpeg)

---

<div class="post-metadata">

**Author:** ![PhilippeJ](https://avatars.discourse-cdn.com/v4/letter/p/a5b964/32.png) [@PhilippeJ](https://forum.logik.tv/u/PhilippeJ)\
**Post date:** [November 4, 2024, 2:18pm UTC](https://forum.logik.tv/t/bfx-bug/11683/2 "2024-11-04T14:18:18Z")

</div>

A “mop node” would be a Back Clip, you could try to disconnect the output matte from the Back Clip. If this work, it would be interessting to see what the segment the bfx is on and what the segments below it look like.

---

<div class="post-metadata">

**Author:** ![Lightningad](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.logik.tv/lightningad/32/2191_2.png) [@Lightningad](https://forum.logik.tv/u/Lightningad)\
**Post date:** [November 4, 2024, 2:30pm UTC](https://forum.logik.tv/t/bfx-bug/11683/3 "2024-11-04T14:30:05Z")

</div>

Thanks Philippe…thats sorted it. Disconnecting the back clip let me out of bfx, and i noticed that the BFX track was not directly above the Backclip but there was an empty track between

 ![Screenshot 2024-11-04 at 14.27.50](https://us1.discourse-cdn.com/flex020/uploads/thedepartmentofexternalservices/original/2X/d/d1288b3fb730796c1a291c17b2beec63af8207e8.png)  
…i never realised a gap there would cause a world of pain. Re-arranged the timeline and suddenly all works!

---

<div class="post-metadata">

**Author:** ![philm](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.logik.tv/philm/32/9286_2.png) [@philm](https://forum.logik.tv/u/philm)\
**Post date:** [November 4, 2024, 2:44pm UTC](https://forum.logik.tv/t/bfx-bug/11683/4 "2024-11-04T14:44:50Z")

</div>

what does ‘mop’ stand for?

---

<div class="post-metadata">

**Author:** ![ytf](https://sea2.discourse-cdn.com/flex020/user_avatar/forum.logik.tv/ytf/32/109_2.png) [@ytf](https://forum.logik.tv/u/ytf)\
**Post date:** [November 4, 2024, 4:31pm UTC](https://forum.logik.tv/t/bfx-bug/11683/5 "2024-11-04T16:31:47Z")

</div>

mit out picture.

---

<div class="post-metadata">

**Author:** ![finnjaeger](https://avatars.discourse-cdn.com/v4/letter/f/e99b99/32.png) [@finnjaeger](https://forum.logik.tv/u/finnjaeger)\
**Post date:** [November 4, 2024, 9:23pm UTC](https://forum.logik.tv/t/bfx-bug/11683/6 "2024-11-04T21:23:05Z")

</div>

Mit ohne Picture