Niagara Timeline cannot be displayed

Hi everyone, when I try to create a Niagara Emitter, the timeline cannot be displayed, it show an error message like this:

Failed to add module EmitterState to section of type MovieSceneNiagaraEnwtterSection.
Message: Failed to bind ‘num loops’ for module.
Message: Could not find the default pin for this input in the source graph, it may be hidden by a static switch.

I don’t know how to fix. Please help me because I can do nothing with this problem.
Thanks a lot!

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I am also having this issue. I tried migrating a niagara system from 4.25 to 4.26 including the emitter state module from 4.25. No success. Seems like something in 4.26 is broken in the niagara timeline system that binds to the emitter state.

The solution that worked for me is:
go to Initialize Particle → Mesh Attributes set the scale mode to uniform (it’s by default in unset).

Hello I have the same problem and all the computers in my class are having the same error, maybe because of the source control. We still trying to fix it, and no solution worked for us, if any of you have another way to solve this I will be really grateful to hear it. Thanks and good luck!

I’m still looking for an answer with this one! Have the same issue and look forward to fixing it!

Thank you. This solution worked for me as well.

I had the same problem after switching to 4.26. Timelines for some reason became visible again after I set LoopBehavior in EmitteState module to multiple and then enabled loop delay.

334582-screenshot-2021-04-03-182607.png

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Thank you so much! It worked!

it worked for me too, I currently work on 4.26 and the problem was with emitters created in the same version

Thank you! Your solution do works.